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Capability in robotics
Obstacle avoidance, in robotics, is a critical aspect of autonomous navigation and control systems. It is the capability of a robot or an autonomous system/machine
Obstacle_avoidance
Chinese unmanned aerial vehicle
design as well as a push-and-release propeller locking mechanism. An obstacle avoidance system was added, which uses four cameras (two facing forward and
DJI_Phantom
Series of teleoperated compact quadcopter drone models
30 minutes. To minimize weight, the Mavic Mini does not include an obstacle avoidance system, though it does include geofencing technology and AeroScope
DJI_Mini
Series of teleoperated compact quadcopter drone models
Panorama". The Air also has a SmartCapture feature, a three-directional obstacle avoidance system with seven sensors, and a 2375 mAh battery giving it a maximum
DJI_Air
Chinese camera drone
transmission system (when using a controller or FPV goggles). The Neo lacks obstacle avoidance and a MicroSD card slot, though it does have 22GB of internal memory
DJI_Neo
American UAV manufacturer based in San Mateo
gimbal stabilized 4K main camera. It had subject follow mode and obstacle avoidance. The R1 was powered by a Nvidia Jetson on-board computer. Controlling
Skydio
Series of autonomous robotic vacuum cleaners sold by iRobot
separate sweep canisters, more powerful vacuums, mopping technology, obstacle avoidance, and performance maps displayed via smartphone apps. Newer models
Roomba
Series of teleoperated compact quadcopter drone models
strengthened arms and a more streamlined body. The Mavic 2 features 10 obstacle avoidance sensors on all sides. Battery capacity was increased to 3850 mAh,
DJI_Mavic
Term in robotics and motion planning
Automation. pp. 560–565. Chakravarthy, A.; Ghose, D. (September 1998). "Obstacle avoidance in a dynamic environment: A collision cone approach". IEEE Transactions
Velocity_obstacle
Motorcar safety system
A collision avoidance system (CAS), also known as a pre-crash system, forward collision warning system (FCW), or collision mitigation system, is an advanced
Collision_avoidance_system
The Obstacle Collision Avoidance System (OCAS) is designed to alert pilots if their aircraft is in immediate danger of flying into an obstacle. OCAS uses
Obstacle Collision Avoidance System
Obstacle_Collision_Avoidance_System
Chinese camera drone
vision-based obstacle avoidance system. The Lito X1's obstacle avoidance system is complemented by a forward-facing lidar, allowing it to avoid obstacles in low-light
DJI_Lito
Large autonomous underwater vehicle for laying fibre-optic cable
Otter aircraft. The bow section was free-flooding and contained the obstacle avoidance sonar, forward variable ballast tank/pump, acoustic telemetry transducer
Theseus_(AUV)
dealing with uncertainty from sensor and modeling errors. Unlike other obstacle avoidance algorithms, VFH takes into account the dynamics and shape of the robot
Vector_Field_Histogram
Widely exported German frigate design
Nulka active missile decoy bays, and the TSM 5424 Petrel mine and obstacle avoidance sonar system. All upgrades and new builds were scheduled for completion
MEKO_200
Design project of the Royal Netherlands Navy
equipped with a Thales sonar suite, which will include bow, flank, and obstacle avoidance sonars, an underwater voice communication system, an intercept array
Orka-class_submarine
Graph data structure for pathfinding
journal requires |journal= (help) Brand, Sandy (2009). Efficient obstacle avoidance using autonomously generated navigation meshes (PDF) (Master thesis)
Navigation_mesh
German company
seen on the roof of the vehicle. SICK/IBEO LIDARs were also used for obstacle avoidance, mapping, and pedestrian tracking on WAMbot, the autonomous vehicle
Sick_AG
Chinese agricultural drone
from its predecessor primarily in the addition of a forward/rearward obstacle avoidance system and the capability for both manual and automatic operations
DJI_Agras
Chinese camera drone
magnesium-aluminum alloy, and features forward, upward, and downward-facing obstacle avoidance sensors. The Inspire 2 is powered by four Model 3512 motors driving
DJI_Inspire
Artificial life algorithm
mass) of local flockmates More complex rules can be added, such as obstacle avoidance and goal seeking. The basic model has been extended in several different
Boids
Class of multi-role warships for the Pakistan Navy
suite. The YAKAMOS is a hull-mounted, medium-frequency anti-submarine/obstacle-avoidance sonar, capable of detecting sub-surface targets within an azimuth
Babur-class_corvette
Soft-bodied, aquatic invertebrates
include phototaxis based on sunlight (positive) or shadows (negative), obstacle avoidance, and control of swim-pulse rate. Box jellyfish possess "proper eyes"
Jellyfish
Chinese consumer goods company
"S" line of robot vacuums, introduced in 2018, have an integrated obstacle avoidance system to discern objects down to 5 cm wide by 3 cm high. As the cleaners
Roborock
Class of cnidarians distinguished by their cube-shaped medusae
also display complex, probably visually-guided behaviors such as obstacle avoidance and fast directional swimming. Research indicates that, owing to the
Box_jellyfish
Vehicle operated with reduced or no human input on public roads
and dynamic cruise control, collision avoidance, lane-keeping/switching, emergency braking, obstacle avoidance, but still requires the driver to remain
Self-driving_car
Mid-size crossover SUV
and urban expressways. Its capabilities include lane change assist, obstacle avoidance, and parking assist in vertical/parallel/diagonal parking spots. The
Deepal_S07
Nuclear attack submarine
suite Thales ETBF DSUV 62C towed array sonar Thales SEACLEAR mine and obstacle avoidance sonar Thales VELOX-M8 broadband sonar interceptor Thales NUSS-2F Mk2
Suffren-class_submarine
Vehicle safety technology
Kanarachos, Stratis (2009). "A new method for computing optimum obstacle avoidance steering manoeuvres of vehicles". International Journal of Vehicle
Automated emergency braking system
Automated_emergency_braking_system
French camera drone
link between the aircraft and the operator. The Anafi Ai also has an obstacle avoidance system which uses two cameras mounted on gimbals, allowing them to
Parrot_Anafi
Aircraft collision avoidance system
collision avoidance system (TCAS; /ˈtiːkæs/ TEE-kas), also called an airborne collision avoidance system (ACAS), is an aircraft collision avoidance system
Traffic collision avoidance system
Traffic_collision_avoidance_system
Chinese in-home robotics appliances company
2021, Ecovacs release the DEEBOT T9+, a robotic vacuum which uses obstacle avoidance technology to avoid objects when cleaning, it also comes complete
Ecovacs_Robotics
South Korean anti-ship missile
missile systems; it can be retargeted in-flight and has improved obstacle avoidance with a 200 km (120 mi) range. There is a cruise missile called the
SSM-700K_C-Star
American camera drone
though it does not fold like some competing models, and an improved obstacle avoidance system with six 4K navigation cameras instead of 12. The drone is
Skydio_2
French research and development project (2013–)
humans and vehicles are moving. To address this problem, it has an obstacle avoidance module. Many navigation algorithms are constantly running on the robot
Air-Cobot
Chinese robotics company
with a vision system that enables real-time mapping, navigation, and obstacle avoidance with human-like precision. In November 2023, Fourier launched MetaMotus™
Fourier_(company)
Electric mid-size sedan
features such as automatic emergency braking, lane change assist, and obstacle avoidance. The L07 is available in both a pure electric or range-extender powertrains
Deepal_SL03
Open project for flight control hardware
the first competitors to successfully implement computer vision for obstacle avoidance. Revisiting the project in subsequent years, Lorenz realized that
Pixhawk
South African navy frigates
Designation Sights, a Thales UMS4132 Kingklip Sonar, and an MDS 3060 Obstacle Avoidance Sonar. Also included is a computer-based "Naval Logistic Management
Valour-class_frigate
Project to replace existing navy frigates
sonar) Sea Sabre (towed body variable depth sonar) Bow sonar Mine and obstacle avoidance Radars: Thales APAR block 2.0, X-band multifunctional radar Thales
Anti-Submarine Warfare Frigate (Royal Netherlands Navy)
Anti-Submarine_Warfare_Frigate_(Royal_Netherlands_Navy)
Class of UAE Navy corvettes
Fire Control X-band radar NDS 3070 Vanguard hull-mounted mine and obstacle avoidance sonar Armament 1 × OTO Melara 76 mm/62 caliber naval gun 2 × Rheinmetall
Baynunah-class_corvette
Chinese technology company
360° "Infinity" gimbal, 51 min flight time, and omnidirectional obstacle avoidance. The DJI Neo is an ultra-lightweight drone released in 2024. The DJI
DJI
2025 video game
example, on Snake Island in the Black Sea), in which the user practices obstacle avoidance, precise maneuvers, and attacks on stationary and moving targets.
Ukrainian Fight Drone Simulator
Ukrainian_Fight_Drone_Simulator
localization and mapping (SLAM), computer vision, and motion planning (obstacle avoidance). Different research groups have employed MRPT to implement projects
Mobile Robot Programming Toolkit
Mobile_Robot_Programming_Toolkit
Search for a missing Boeing 777 in the southern Indian Ocean
with an underwater mud volcano despite its use of forward-looking obstacle avoidance sonar. The towfish was later recovered by the Havila Harmony and transferred
Search for Malaysia Airlines Flight 370
Search_for_Malaysia_Airlines_Flight_370
Battery electric compact crossover SUV
which includes high-speed navigation, automatic parking, and active obstacle avoidance. An iTAC intelligent torque control system adjusts torque distribution
Fangchengbao_Tai_3
Autonomous motorsport racing series
challenges of increasing difficulty, starting from a solo lap and simple obstacle avoidance to 1-to-1 full races. The simulation environment provided the teams
Indy_Autonomous_Challenge
Chinese camera drone
May 2017. The Spark is a small quadcopter with forward and downward obstacle avoidance sensors and satellite navigation. The drone is lighter and smaller
DJI_Spark
Directed growth of plants in response to touch
to be negatively thigmotropic. Research suggests that this active obstacle avoidance by roots is driven by polar auxin transport. Thigmotropism seems to
Thigmotropism
American robotics company
with obstacle avoidance, following dismounted infantry and other vehicles and semi-autonomous operation such as teleoperation with obstacle avoidance. Negotiator
IRobot
Submarine of the United States
(10 cm) towed body position monitoring system development of a new obstacle-avoidance sonar system development of a highly accurate target management system
USS_Dolphin_(AGSS-555)
American stealthy anti-ship cruise missile
successful flight test, conducted to evaluate low-altitude performance and obstacle avoidance. Dropped from a B-1B, the missile navigated a series of planned waypoints
AGM-158C_LRASM
Chinese camera drone
three-axis gimbal. The drone also has a forward and downward-facing lidar obstacle avoidance system. Power is provided by a 3110 mAh battery, giving the Flip a
DJI_Flip
Chinese industrial drone
Improvements over its predecessor include a built-in lidar/radar-based obstacle avoidance system, an O4 Enterprise transmission system, the ability to mount
DJI_Matrice
Chinese Solar System exploration program
embassies and international organizations to witness hovering and obstacle avoidance test for Mars Lander of China's first Mars exploration mission at
Planetary Exploration of China
Planetary_Exploration_of_China
Soviet orbiter/lander mission to Mars (1971–1972)
15-meter umbilical. Two small metal rods were used for autonomous obstacle avoidance, as radio signals from Earth would take too long to drive the rovers
Mars_3
American camera drone
minutes compared to the 27 minutes of the Mavic. The Karma also lacks obstacle avoidance and downward-facing sensors. However, the Karma was also noted to
GoPro_Karma
Most widely known generalized inverse of a matrix
ISSN 0036-1445. Maciejewski, Anthony A.; Klein, Charles A. (1985). "Obstacle Avoidance for Kinematically Redundant Manipulators in Dynamically Varying Environments"
Moore–Penrose_inverse
created in 2013. It has a stereo vision system that allows autonomous obstacle avoidance even in unknown and unprepared environments. The DelFly Nimble, presented
DelFly
Submarine sonar detection system
flank and towed arrays. Known components include: Type 2077 Parian obstacle avoidance sonar Type 2081 environmental monitor Type 2094 oceanographic sonar
Sonar_2076
of Mars as part of the Mars Pathfinder mission; equipped with an obstacle avoidance program, Sojourner was capable of planning and navigating routes to
History_of_robots
Three dimensional, cable-suspended camera
control each aspect of the camera system, including motion, video, and obstacle avoidance. In the December 20, 2009 Las Vegas Bowl between the Oregon State
Skycam
Austrian-Canadian roboticist and futurist (born 1948)
computer (the Stanford Cart). The robot was able to negotiate cluttered obstacle courses. Another achievement in robotics was the discovery of new approaches
Hans_Moravec
Chinese delivery drone
the batteries removed. The FlyCart 30's avionics include a visual obstacle avoidance system, forward and backward-looking phased array radars, and an ADS-B
DJI_FlyCart
Aircraft obstacle avoidance systems
and Balisors are sometimes used for marking power lines. The Obstacle Collision Avoidance System allows the standard lights to remain off until an aircraft
Aviation_obstruction_lighting
Family of all-terrain utility vehicles
capable of autonomous operations such as waypoint following with obstacle avoidance, and following dismounted infantry soldiers, as well as other vehicles
John_Deere_Gator
Pattern of motion in a visual scene due to relative motion of the observer
flow sensors in unmanned aerial vehicles (UAVs), for stability and obstacle avoidance, is also an area of current research. As early as Euclid's Optics
Optical_flow
Australian military ship class
From Warramunga onwards, ships were launched with a Petrel Mine and Obstacle Avoidance Sonar system. this was later retrofitted to Anzac. All ships were
Anzac-class_frigate
Departure route from an airport
the lowest climb gradient. It strikes a balance between terrain and obstacle avoidance, noise abatement (if necessary), and airspace management considerations
Standard_instrument_departure
Technologies used to prevent collisions and groundings at sea
independent decision-making. These systems support automated navigation, obstacle avoidance, and adherence to COLREGs without human intervention. In the recreational
Maritime Collision Avoidance System
Maritime_Collision_Avoidance_System
Intellectual capacity of fish
Pavlovian and operant conditioning, such as reversal learning, novel obstacle avoidance, and passing simultaneous two-choice tasks. Some fish also match mammals
Fish_intelligence
2003 Valour-class frigate
M-Tek Target Designation Sights Sonar: Thales UMS4132 Kingklip sonar Obstacle avoidance sonar: MDS 3060 Electronic warfare & decoys ESM/ECM: Saab Grintek
SAS_Mendi
Chinese aircraft manufacturer
released Typhoon H, using Intel RealSense 3D depth camera technology for obstacle avoidance and was awarded CES "Best Drone." In August, the SkyView FPV headset
Yuneec_International
American entrepreneur and author
multiple patents related to the technology, including patents on obstacle avoidance systems, situational awareness, dynamic lighting control, and projecting
David_L._Rose
Ship class of the Royal Malaysian Navy
Thermal imager: Rheinmetall TMEO Sonar: L-3 ELAC Nautik NDS-3060 Obstacle Avoidance sonar IFF system: Aeromaritime Electronic warfare & decoys ESM: Thales
Kedah-class_patrol_vessel
maximum clearance from any obstacle. Fox, D.; Burgard, W.; Thrun, S. (1997). "The dynamic window approach to collision avoidance". IEEE Robotics & Automation
Dynamic_window_approach
Branch of robotics
repertoire to work with dictating what behaviors to use and when, obstacle avoidance and battery charging can provide a foundation to help the robots learn
Behavior-based_robotics
Italian class of replenishment tankers
Leonardo Link 11-16-22JREAP 2 × Leonardo Janus-N IRST system Leonardo obstacle avoidance sonar FFBNW Torpedo Detection Sonar CMS, Command Management System
Vulcano-class logistic support ship
Vulcano-class_logistic_support_ship
Delay-based audio effects system
Hewitt, Nathan; Hu, Boyi; Gu, Yu (1 April 2023). "Socially Aware Robot Obstacle Avoidance Considering Human Intention and Preferences". International Journal
Layered_costmaps
2002 Valour-class frigate
M-Tek Target Designation Sights Sonar: Thales UMS4132 Kingklip sonar Obstacle avoidance sonar: MDS 3060 Electronic warfare & decoys ESM/ECM: Saab Grintek
SAS_Isandlwana
including deep space network, atmospheric entry, lander hovering and obstacle avoidance. Long March 5, the only launch vehicle capable of delivering the spacecraft
Chinese_space_program
Necessary condition for optimality associated with dynamic programming
Generalization of Bellman's Equation with Application to Path Planning, Obstacle Avoidance and Invariant Set Estimation". Automatica. 127 109510. arXiv:2006
Bellman_equation
Japanese unmanned helicopter
Berkeley Aerobot Team website. Retrieved 19 August 2015. RMax Helicopter Obstacle Avoidance via YouTube. Retrieved 19 August 2015. Evan Ackerman. "Yamaha Demos
Yamaha_R-MAX
Visual field loss on the left or right side of the vertical midline
"create" artificial peripheral vision into the non-blind field for obstacle avoidance and motion detection.[citation needed] Certain counterbalancing brain
Homonymous_hemianopsia
Israeli unmanned surface vehicle
(5,500 lb) payload Sensors & processing systems electro-optical, obstacle avoidance sensors Armament 7.62mm remote-controlled stabilized weapon station
Silver_Marlin
Attack submarine class of the Royal Netherlands Navy
to capture HD footage, both day and night Addition of a mine and obstacle avoidance sonar Refurbishing of the pressure hull Introduction of a new combat
Walrus-class_submarine
American guide dog school
stopping at any change in ground elevation as well as overhead obstacles, and obstacle avoidance. This 8 phase program typically lasts two to three months
Guide_Dogs_for_the_Blind
Controlling robots from a distance
the device may operate somewhat independently in matters such as obstacle avoidance, also commonly employed in planetary rovers. Devices designed to allow
Telerobotics
American computer vision company
robots, drones and industrial automation systems for tasks such as obstacle avoidance, navigation and manipulation. Reuters reported in 2025 that RealSense
RealSense
Layered model for component organization in software and robotics
the eat-food layer takes into account the decision of the lowest obstacle-avoidance layer. Behavior need not be planned by a superior layer, rather behaviors
Hierarchical_control_system
American zoologist (1915–2003)
Griffin, Donald; Galambos, Robert (April 1941). "The Sensory Basis of Obstacle Avoidance by Flying Bats". The Journal of Experimental Zoology. 86 (3): 481–505
Donald_Griffin
Kedah-class offshore patrol vessel
Thermal imager: Rheinmetall TMEO Sonar: L-3 ELAC Nautik NDS-3060 Obstacle Avoidance sonar IFF system: Aeromaritime Electronic warfare & decoys ESM: Thales
KD_Selangor
Chinese-American computer engineer and neuroscientist
Juyang (2007). "Online-learning and Attention-based Approach to Obstacle Avoidance Using a Range Finder". Journal of Intelligent and Robotic Systems
Juyang_Weng
vicinity based on hydrodynamic signatures; the purpose is to assist in obstacle avoidance and object tracking. The biomimetic lateral line system has the potential
Artificial_lateral_line
Israeli roboticist
of Michigan. Borenstein is well known for his work in autonomous obstacle avoidance, and is credited with the development of the Vector Field Histogram
Johann_Borenstein
Avionics system to avoid aircraft collision
can use several types of collision avoidance systems to prevent unintentional contact with other aircraft, obstacles, or the ground. Some of the systems
Airborne collision avoidance system
Airborne_collision_avoidance_system
Approach used in computer vision systems
Books, Upper Saddle River. ISBN 0-13-030796-3. H. Moravec (1980). "Obstacle Avoidance and Navigation in the Real World by a Seeing Robot Rover". Tech Report
Corner_detection
Israeli loitering munition
one under the belly, as well as obstacle avoidance sensors to prevent the air vehicle from colliding with obstacles in urban areas. With the lethal payload
IAI_Rotem_L
Mission including first robotic rover to operate on Mars (1997)
scientific technologies, such as airbag-mediated touchdown and automated obstacle avoidance, both later exploited by the Mars Exploration Rover mission. It also
Mars_Pathfinder
Service robot by Qihan Technology Co. Ltd
Voice Interaction & localization, Facial Recognition, Video Chat, Obstacle Avoidance, and Auto charging. Sanbot robot adopts components and systems from
Sanbot
OBSTACLE AVOIDANCE
OBSTACLE AVOIDANCE
Boy/Male
Tamil
Vighnahara | விகà¯à®¨à®¾à®¹à®°à®¾Â
Remover of obstacles
Vighnahara | விகà¯à®¨à®¾à®¹à®°à®¾Â
Boy/Male
Hindu, Indian, Punjabi, Sikh
Winner over Obstacles
Boy/Male
Tamil
Winner over obstacles
Girl/Female
Gujarati, Hindu, Indian, Malayalam, Marathi, Sanskrit, Telugu
Without Obstacles
Boy/Male
Tamil
Vignaharta | விகà¯à®¨à®¾à®¹à®¾à®°à®¤à®¾Â
Demolisher of obstacles
Vignaharta | விகà¯à®¨à®¾à®¹à®¾à®°à®¤à®¾Â
Boy/Male
Hindu
No obstacles, Calm
Girl/Female
Tamil
Avigna | அவிகà¯à®¨à®¾
No obstacles
Avigna | அவிகà¯à®¨à®¾
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Punjabi, Sikh
Winner over Obstacles
Girl/Female
Hindu
Obstacle
Boy/Male
Tamil
Avingha | அவிநà¯à®•à®¾Â
Remover of obstacles
Avingha | அவிநà¯à®•à®¾Â
Boy/Male
Sikh
Winner over obstacles
Girl/Female
Tamil
Vignya | விகà¯à®¨à¯à®¯
Obstacle
Vignya | விகà¯à®¨à¯à®¯
Boy/Male
Bengali, Hindu, Indian, Kannada
Demolisher of Obstacles
Boy/Male
Indian, Sanskrit
Obstacle
Boy/Male
Tamil
Remover of obstacles
Boy/Male
Tamil
No obstacles, Calm
Boy/Male
Hindu
Remover of obstacles
Girl/Female
Indian
No obstacles
Boy/Male
Hindu
Remover of obstacles
Boy/Male
Hindu, Indian, Kannada
Remover of Obstacles
OBSTACLE AVOIDANCE
OBSTACLE AVOIDANCE
Girl/Female
Biblical
Appearance, or force, of waters.
Girl/Female
Teutonic
Intelligent maiden.
Girl/Female
Tamil
Supraja | ஸà¯à®ªà¯à®°à®œà®¾Â
Goodness of all people
Surname or Lastname
Southern Irish
Southern Irish : Anglicized form of Gaelic Ó Catháin ‘descendant of Cathán’, a personal name from a diminutive of cath ‘battle’. Compare Kane.Irish : occasionally an Anglicized form of Ó Céin ‘descendant of Cian’, a personal name meaning ‘distant’, ‘long’.English : variant spelling of Keen.Americanized spelling of German Kühn(e) (see Kuehn).
Girl/Female
Australian, Danish, German, Swedish
Little Woman; War
Girl/Female
American, Australian, British, English, French, Indian, Latin, Sikh
Jay Bird; Happy
Boy/Male
Australian, Christian, French, Gaelic, Irish
Fair
Girl/Female
Arabic, Muslim
Faithful and Devoted
Boy/Male
Muslim
Leader, President, Head, Chief
Boy/Male
Hindu
Compassionate
OBSTACLE AVOIDANCE
OBSTACLE AVOIDANCE
OBSTACLE AVOIDANCE
OBSTACLE AVOIDANCE
OBSTACLE AVOIDANCE
a.
Not capable of self-fertilization; -- said of hermaphrodite flowers in which some structural obstacle forbids autogamy.
a.
Tending to obstruct; presenting obstacles; hindering; causing impediment.
n.
An obstacle formed by turning an ordinary harrow upside down, the frame being buried.
v. i.
To move forward against an obstacle, as a vessel against a current.
v. i.
To interpose obstacles or impediments; to be a hindrance.
n.
A catch; anything that holds, as a hook; an impediment; an obstacle; an entanglement.
n.
That which retards; an obstacle; an obstruction.
v. t.
To block up; to stop up or close, as a way or passage; to place an obstacle in, or fill with obstacles or impediments that prevent or hinder passing; as, to obstruct a street; to obstruct the channels of the body.
n.
Check; hindrance; restraint; obstacle.
n.
That which stops, impedes, or obstructs; as obstacle; an impediment; an obstruction.
v. i.
To be prevented from going farther; to stop by reason of some obstacle; to be stayed.
v.
That which stands in the way, or opposes; anything that hinders progress; a hindrance; an obstruction, physical or moral.
n.
Whatever arrests progress, or limits action; an obstacle, guard, restraint, or rebuff.
n.
Delay; obstacle; hindrance.
v. i.
To conquer; to overcome; as, to surmount difficulties or obstacles.
a.
Incapable of being conquered, overcome, or subdued; unconquerable; insuperable; as, an invincible army, or obstacle.
v. t.
To oppose or check by some obstacle; to check by a return check.
n.
That which obstructs or impedes; an obstacle; an impediment; a hindrance.
v. t.
Hence, anything that retards; a clog; an obstacle to progress or enjoyment.
a.
Incapable of being passed over, surmounted, or overcome; insuperable; as, insurmountable difficulty or obstacle.