Unyielding and indomitable — a four-character idiom meaning not to give in to hardship or pressure; denotes perseverance and fortitude.
彼女は不撓不屈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 produced results.
不撓不屈の姿勢はチーム全体に良い影響を与えた。
The team's indomitable attitude had a positive effect on everyone.
困難に直面しても、不撓不屈でいよう。
Even when facing difficulties, let's remain unyielding.