indefatigable

adjective

in·​de·​fat·​i·​ga·​ble ˌin-di-ˈfa-ti-gə-bəl How to pronounce indefatigable (audio)
: incapable of being fatigued : untiring
an indefatigable worker
indefatigability noun
indefatigableness noun
indefatigably 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 Perriello, a former member of Congress, was creative and indefatigable in his role as special envoy to the Democratic Republic of the Congo during President Barack Obama’s tenure, and his strong relationships on Capitol Hill will be critical for securing high-level attention from Washington. John Prendergast, Foreign Affairs, 27 Feb. 2024 The indefatigable Harvey Mansfield recently urged Harvard colleagues and other academics to take steps toward recovering the true meaning of the Ivory Tower. Paul O. Carrese, National Review, 13 Feb. 2024 In January, Bowman was condemned for praising Norman Finkelstein, the author and indefatigable Israel critic who compared the Hamas attacks to John Brown’s raid on Harpers Ferry, at a panel in Westchester. Ross Barkan, New York Times, 7 Feb. 2024 The inflection point came with his indefatigable reporting on the 1996 murder of Tupac Shakur. Michael Hiltzik, Los Angeles Times, 6 Feb. 2024 His Weekend Update favorite Willie, meanwhile, makes the concept of smiling through the unthinkable uniquely funny, with Thompson's indefatigable charm buoying us as much as poor Willie himself. Dennis Perkins, EW.com, 14 Dec. 2023 After playing 19 characters in a one-person adaptation of Charles Dickens’s Great Expectations last year, the indefatigable comic and actor is back to play 23 in a solo Hamlet, adapted by her brother, Mark Izzard. Sara Holdren, Vulture, 4 Jan. 2024 For nearly four months, SAG-AFTRA’s indefatigable duo were the face of the 118-day strike by the union’s 160,000 members. Cynthia Littleton, Variety, 6 Dec. 2023 Economic growth is a consequence of indefatigable people being matched with capital. John Tamny, Forbes, 29 Nov. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'indefatigable.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

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

First Known Use

1608, in the meaning defined above

Time Traveler
The first known use of indefatigable was in 1608

Dictionary Entries Near indefatigable

Cite this Entry

“Indefatigable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/indefatigable. Accessed 19 Mar. 2024.

Kids Definition

indefatigable

adjective
in·​de·​fat·​i·​ga·​ble ˌin-di-ˈfat-i-gə-bəl How to pronounce indefatigable (audio)
: capable of working a long time without tiring : tireless
an indefatigable teacher
indefatigably adverb

More from Merriam-Webster on indefatigable

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