indomitable /ɪnˈdɒmɪtəbəl/

• 1. 

  ADJ If you say that someone has an indomitable spirit, you admire them because they never give up or admit that they have been defeated. 不屈不挠的; 不服输的 [正式]

  例：

  ...a woman of indomitable will.

  ...一个有着不屈意志的女人。