/ ɪnˈdɒmɪtəbl; NAmE ɪnˈdɑːm-/ adjective
( formal , approving ) not willing to accept defeat, even in a difficult situation; very brave and determined
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WORD ORIGIN
mid 17th cent. (in the sense untameable): from late Latin indomitabilis , from in- not + Latin domitare to tame.