My sister is indefatigable or tireless in her efforts on behalf of the homeless. She volunteers at the shelter everyday and writes to her senator constantly with an indefatigable, endless determination. She never seems to tire of coming up with new ways to help. She is an indefatigable, energetic, and highly active defender of the rights of those who are in need.
Quiz: What does it mean to be indefatigable when you do something?
- You seem to be able to do it without losing any energy.
- You are devoted to worthy social causes.
- You embrace it with all of your energy and drive.