: incapable of being fatigued : untiring an indefatigable worker.

Where did the word indefatigable come from?

Indefatigable comes from Latin indefatigabilis, formed from the prefix in- "not" plus defatigare "to tire out." Here the prefix de- means "entirely." You can remember the root fatigare because it sounds so much like the English fatigue.

What does indefatigable mean in literature?

The definition of indefatigable is a person or something that has tireless persistence. Someone who keeps trying and trying to learn a skill and who never gives up is an example of a person who would be described as indefatigable. adjective. 2. That cannot be tired out; not yielding to fatigue; untiring.