noun

the ability to endure an unpleasant or difficult process or situation without giving way.

she was close to the limit of her endurance

toleration,bearing,tolerance,sufferance,fortitude,forbearance,patience,acceptance,resignation,stoicism,stamina,staying power,perseverance,persistence,tenacity,pertinacity,doggedness,indefatigability,tirelessness,resoluteness,resolution,determination,Dunkirk spirit,stickability,guts,grit,spunk,bottle

adjective

denoting or relating to a race or other sporting event that takes place over a long distance or otherwise demands great physical stamina.

the annual 24-hour endurance race