indomitability UK /ɪnˌdɒm.ɪ.təˈbɪl.ɪ.tiː/US /ɪnˌdɑm.ɪ.təˈbɪl.ɪ.ti/ noun2 •The quality of being indomitable.I love Joan's indomitability and intelligence. She's very courageous. And she's a hell of a kisser. — 2010 •The quality of being undefeated, resolute, and tenacious.