indefatigable
Say it: in-dih-FAT-ih-guh-bul /ˌɪndɪˈfatɪɡəb(ə)l/ · adjective
What “indefatigable” means
Keeping going without seeming to get tired.
More precisely: Persisting tirelessly; never seeming to get tired.
Example: “Our indefatigable coach runs every interval alongside the team.”
When to use it
When someone keeps working or helping with seemingly endless energy. A strong, formal compliment for sustained effort.
Similar words
tireless, untiring, relentless
Where it comes from
From Latin in- 'not' + defatigare, 'to wear out'.
Quick check
After everyone else needs a rest, the volunteer keeps carrying boxes with the same cheerful energy. She's…
indefatigable or impatient?
Show the answer
indefatigable
Learn 5 new words a day in Kinquire. Each with a picture, how to say it, an example and a quick check, then spaced review so you actually keep them. Free to start.
Learn “indefatigable”