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[in-di-fat-i-guh-buh l] /ˌɪn dɪˈfæt ɪ gə bəl/
incapable of being tired out; not yielding to fatigue; untiring.
Origin of indefatigable
1580-90; < Latin indēfatīgābilis untiring, equivalent to in- in-3 + dēfatīgā(re) to tire out (see de-, fatigue) + -bilis -ble
Related forms
indefatigability, indefatigableness, noun
indefatigably, adverb
tireless, inexhaustible, persevering. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for indefatigable
  • He has an upbeat spirit that is truly indefatigable-even a blast of squid ink to the face won't put him off.
  • And my indefatigable guides scoured antique shops with me to salvage letters that might eventually have been thrown away.
  • She was indefatigable, which made her abrupt exit even harder to take.
  • Wood became an indefatigable promoter of standardized testing.
  • When fully aroused his perseverance is indefatigable.
  • He is an adventurous and indefatigable traveler as well as a brilliant explorer of arcane problems and archives.
  • Indeed, billion-dollar industries revolve around our indefatigable obsession with celebrities.
  • His body was indefatigable, doing him yeoman service in this breathless chase of pleasures.
  • His only delight was in exercises of piety and in his studies, in which he employed his whole time with indefatigable application.
  • The indefatigable minister flew from place to place in order to superintend the execution of his design.
British Dictionary definitions for indefatigable


unable to be tired out; unflagging
Derived Forms
indefatigability, indefatigableness, noun
indefatigably, adverb
Word Origin
C16: from Latin indēfatīgābilis, from in-1 + dēfatīgāre, from fatīgāre to tire
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for indefatigable

1580s (implied in indefatigably), from French indefatigable (15c.), from Latin indefatigabilis "that cannot be wearied," from in- "not" (see in- (1)) + defatigare "to tire out," from de- "utterly, down, away" + fatigare "to weary" (see fatigue).

Online Etymology Dictionary, © 2010 Douglas Harper
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