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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
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, 16 Feb. 2025 The Assad dynasty ruled Syria with an iron fist, using a personality cult and an indefatigable security apparatus – aspects of daily life for a half century that will require years to overcome and to heal. Scott Peterson, The Christian Science Monitor, 31 Jan. 2025 Next up for the indefatigable Ja: Teaming up with Nelly for Live Nation’s Where The Party At Tour, kicking off in March in New Zealand. Madeleine Marr, Miami Herald, 27 Jan. 2025 Thanks to the indefatigable work of the Harlem African Burial Ground Initiative (HAGBI), helmed by the Rev. Dr. Patricia Singletary of the Elmendorf Reformed Church and former City Council Speaker Melissa Mark-Viverito, the history of the Harlem burial ground has been widely disseminated. Herb Boyd, New York Daily News, 1 Feb. 2025 See all Example Sentences for indefatigable 

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 22 Feb. 2025.

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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