Origin: 1375–1425; late Middle English Related forms
< Late Latin invincibilis.
in·vin·ci·bil·i·ty, in·vin·ci·ble·ness, noun
1. unyielding. Invincible, impregnable, indomitable suggest that which cannot be overcome or mastered. Invincible is applied to that which cannot be conquered in combat or war, or overcome or subdued in any manner: an invincible army; invincible courage. Impregnable is applied to a place or position that cannot be taken by assault or siege, and hence to whatever is proof against attack: an impregnable fortress; impregnable virtue. Indomitable implies having an unyielding spirit, or stubborn persistence in the face of opposition or difficulty: indomitable will.