that cannot be subdued or overcome, as persons, will, or courage; unconquerable: an indomitable warrior.
Origin: 1625–35; < Late Latinindomitābilis < Latinindomit(us) untamed (in-in-3 + domitus, past participle of domāre to subdue, tame, bring under control) + -ābilis-able; compare Latinindomābilis