unflinching (adjective)

1. The unflinching faith of the devotees was evident as they walked barefoot on a bed of nails.

2. In the face of seemingly insurmountable odds, the soldier displayed unflinching courage on the battlefield.

3. The movie depicted the protagonist's unflinching determination to bring justice to a corrupt society.

4. With unflinching resolve, the superhero stood up against the villain, refusing to back down.