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.
Wild Up questions the orchestra status quo, and founder and music director Christopher Rountree stayed the course in his indefatigable mission to promote the music of Julius Eastman. Mark Swed, Los Angeles Times, 5 Dec. 2024 The indefatigable comic also performed at a stand-up comedy show in Beverly Hills, California, on Monday. Edward Segarra, USA TODAY, 21 Nov. 2024 Stefanik is an electrifying speaker, indefatigable defender of Israel and opponent of Hamas, and master of international relations. Armstrong Williams, Baltimore Sun, 18 Nov. 2024 Kerensky was a savvy politician and indefatigable coalition builder, but Kolonitskii credits his skill as a newsmaker to his keen sense of popular moods and his talent as a public speaker. Maria Lipman, Foreign Affairs, 24 Aug. 2021 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 24 Dec. 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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!