不屈

1. Origins, structure, and basic meaning

• Structure: 不屈 (ふくつ) means refusing to yield or give up despite hardship. Both examples modify spirit or resolve.
• Basic usage: An athlete runs through the finish; a protagonist never quits through repeated difficulty.

2. Common pitfalls and similar expressions

• Resolve supporting a finish and an enduring character trait
  • Both sentences use 不屈の精神, but one supports behavior in a race and the other characterizes a protagonist across repeated trials. It is not mere physical strength.