Meaning & use
indefatigable
Never tiring or giving up, even after long or difficult effort.
See it in a sentence
The indefatigable volunteers worked through the night to rebuild the flooded homes.
Her indefatigable enthusiasm kept the whole team motivated during the final week.
A note on using this word
A formal, admiring word; it describes sustained energy or persistence rather than physical strength.
Words with a similar meaning
tirelessuntiring
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
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