indomitable
/ɪnˈdɑmɪtəbəl/
adjective
- Impossible to defeat, discourage, or subdue; very determined and strong.
- The explorer had an indomitable will to reach the South Pole.
- The soldiers showed indomitable courage in the face of overwhelming odds.
- Even after losing her job, she kept an indomitable spirit and started her own business.