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: How does an indefatigable person do something?
- They seem able to do it without losing any energy.
- They delegate the responsibility to someone else.
- They show effort—but not enough to complete the task.