Indomitable; not yielding or being discouraged by difficulties—expressing relentless perseverance and tenacity.
彼女は不屈不撓の精神で研究を続け、ついに成果を出した。
She continued her research with indomitable spirit and finally achieved results.
不屈不撓の姿勢がチーム全体に勇気を与えた。
Their indomitable attitude gave courage to the entire team.
困難に直面しても、不屈不撓で立ち向かおう。
Even when facing hardship, let's confront it with indomitable resolve.