Entry 1 sense Webster, 1913 Indomitable /ĭnˌ-däm'-ət-əb-əl/ · In·dom·i·ta·ble · IPA /ɪnˈdɑmɪtəbl̩/ 01 a. Not to be subdued; untamable; invincible; as, an indomitable will, courage, animal. 1. Not to be subdued; untamable; invincible; as, an indomitable will, courage, animal.