indefatigable
[ in-di-fat-i-guh-buhl ]
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Part of Speechadjective
Origin + Etymology
Early-17th century; French;from the Latin indefatigabilis, from in- "not" + de- "away, completely" + fatigare "wear out"
Synonyms
  • assiduous diligent dogged energetic inexhaustible
Antonyms
  • changing idle inactive indifferent lazy
Definition
incapable of being tired out; not yielding to fatigue; untiring
Example
A) She tried to catch her breath, pushing down the dread of her opponent seeming indefatigable even as her own energy ran dry. B) Little kids always appear indefatigable when they're running around, but lay them down for a nap and they're out in an instant.
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