in·​de·​fat·​i·​ga·​ble | \ ˌin-di-ˈfa-ti-gə-bəl How to pronounce indefatigable (audio) \

Definition of indefatigable

: incapable of being fatigued : untiring an indefatigable worker

Other Words from indefatigable

indefatigability \ ˌin-​di-​ˌfa-​ti-​gə-​ˈbi-​lə-​tē How to pronounce indefatigable (audio) \ noun
indefatigableness \ ˌin-​di-​ˈfa-​ti-​gə-​bəl-​nəs How to pronounce indefatigable (audio) \ noun
indefatigably \ ˌin-​di-​ˈfa-​ti-​gə-​blē How to pronounce indefatigable (audio) \ adverb

Examples of indefatigable in a Sentence

a person of indefatigable patience an indefatigable laborer who can work from sunrise to sunset
Recent Examples on the Web The indefatigable David Attenborough is your guide in this five-part series. Tribune News Service, cleveland, 22 May 2022 Treasury Secretary Janet Yellen and her political allies are indefatigable in their attempt to railroad Congress into agreeing to a global tax deal, and their latest argument is that the pact will be good for U.S. competitiveness. The Editorial Board, WSJ, 8 May 2022 My knees grew sore, my neck stiff from stooping, but Mauser and the others were indefatigable. Will Hunt, The New Yorker, 9 Apr. 2022 The brand has deep roots in triathlon and running, and its ethos centers on the indefatigable pursuit of multiplying human performance: to be 2XU, or two times you. Outside Online, 4 Apr. 2022 And despite the humiliating setback, Carol plows on, more tactfully than before, perhaps, but indefatigable. New York Times, 31 Dec. 2021 Richard, an indefatigable partner at WME, suddenly found his social calendar wide open aside from daughter Demi’s looming 17th birthday. Chris Gardner, The Hollywood Reporter, 10 Mar. 2022 All the Kennedy boys played for the Crimson, but only Ted stuck with it, and this is in keeping with their overall reputations: Jack cavalier and charismatic, Bobby intense and self-righteous, Ted an indefatigable plugger. Fred O’brien, National Review, 3 Mar. 2022 Republican supporters recall an indefatigable campaigner, biking all over the Tempe-area district to knock on thousands of doors. Washington Post, 8 Mar. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'indefatigable.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of indefatigable

1608, in the meaning defined above

History and Etymology for indefatigable

Middle French, from Latin indefatigabilis, from in- + defatigare to fatigue, from de- + fatigare to fatigue

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Time Traveler for indefatigable

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The first known use of indefatigable was in 1608

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Last Updated

26 May 2022

Cite this Entry

“Indefatigable.” Dictionary, Merriam-Webster, Accessed 28 May. 2022.

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More from Merriam-Webster on indefatigable

Nglish: Translation of indefatigable for Spanish Speakers


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