1. 不知疲倦的;坚韧的
If you describe someone or their efforts as tireless, you approve of the fact that they put a lot of hard work into something, and refuse to give up or take a rest.

1. characterized by hard work and perseverance

Synonym: hardworkingindustriousuntiring

2. showing sustained enthusiastic action with unflagging vitality

e.g. an indefatigable advocate of equal rights
a tireless worker
unflagging pursuit of excellence

Synonym: indefatigableunflaggingunwearying