adjective
indomitable
in-DAH-muh-tuh-buhl/ɪnˈdɑːmɪtəbl/
Too determined, brave, or strong to be defeated.
The indomitable mountaineer continues upward despite fierce wind, sleet, and battered clothing.

Etymology
Something indomitable cannot be tamed or subdued. Applied to a person or spirit, that image becomes unyielding resolve: resistance to being defeated, discouraged, or brought under control.
In context
you will build indomitable confidence because you're moving from within there's no outside external forces that are gonna [ __ ] knock you off of what you know
More examples
- Even after three failed attempts, the indomitable climber tries again.
- They face the long recovery with indomitable courage.
- Years of hardship never broke her indomitable will.
Forms
indomitability noun — The quality of resisting defeat or discouragement.
indomitably adverb — With determination that cannot be overcome.
Similar words
- invincible
- Emphasizes inability to be beaten rather than determined character.
- unyielding
- Emphasizes refusing to give way, not necessarily resisting defeat.
- resolute
- Emphasizes firm purpose without implying that defeat is impossible.