Definition of INDEFATIGABLE (original) (raw)
: incapable of being fatigued : untiring
Synonyms
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 Conservatives must be indefatigable in preserving a spirit of appreciation for the sacrifices of our nation’s heroes. —
John Hatzis, National Review, 13 Sep. 2024 That raised the stakes for the 1964-1965 New York fair — as Robert Moses, its indefatigable organizer well knew. —Ruth D. Nelson / Made By History, TIME, 13 Sep. 2024 Slotkin, a prodigious fundraiser and the only Jewish member of Michigan’s congressional delegation, is also an indefatigable campaigner and leaves little to chance. —Detroit Free Press, 6 Sep. 2024 Bad As Me album about the autumn of life that speaks to the 91-year-old country icon’s legendarily indefatigable spirit and boundless energy well into his six decade as a performer. —Gil Kaufman, Billboard, 15 Aug. 2024 See all Example Sentences for indefatigable 
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
Cite this Entry
“Indefatigable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/indefatigable. Accessed 22 Sep. 2024.
Share
More from Merriam-Webster on indefatigable
Last Updated: 22 Sep 2024 - Updated example sentences
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!