IPA: /ɪnˈdɒmɪtəbl/
KK: /ɪnˈdɑːmətəbl/
Not able to be defeated or controlled; showing great determination and strength.
Her indomitable spirit inspired everyone around her to keep fighting.
Indomitable is formed from "in-" (meaning not) and "domitare" (meaning to tame or subdue). The word describes a spirit or will that cannot be tamed or subdued, hence representing an unyielding nature.
Think of a spirit that is 'not' ('in-') able to be 'tamed' ('domitare') — that's why indomitable means impossible to subdue.