Definition of indomitable adjective from the Oxford Advanced Learner's Dictionary

 

indomitable

 adjective
adjective
BrE BrE//ɪnˈdɒmɪtəbl//
 
; NAmE NAmE//ɪnˈdɑːmɪtəbl//
 
(formal, approving) Brave
 
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not willing to accept defeat, even in a difficult situation; very brave and determined an indomitable spirit an indomitable campaigner for human rights See related entries: Brave Word Origin mid 17th cent. (in the sense ‘untameable’): from late Latin indomitabilis, from in- ‘not’ + Latin domitare ‘to tame’.
See the Oxford Advanced American Dictionary entry: indomitable