un·​tir·​ing | \ ˌən-ˈtī-riŋ How to pronounce untiring (audio) \

Definition of untiring

: not becoming tired : indefatigable an untiring worker

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Other Words from untiring

untiringly adverb

Examples of untiring in a Sentence

the camel's reputation as an untiring beast of burden the detective's untiring investigation of the crime finally led to several arrests

Recent Examples on the Web

All speakers paid tribute to Jack Gross, owner of the new station, for his untiring efforts to bring San Diego its own television station. sandiegouniontribune.com, "May 17, 1949: San Diego gets a TV station," 17 May 2018 Still, Clark's adrenaline and untiring preparation propelled her to a second place finish in Oslo and a third place finish at the Burton US Open the following month. Nihal Kolur, SI.com, "Kelly Clark's Quest for Her Fifth Olympic Games is About More Than Just a Record," 30 Oct. 2017 The public eye in Pakistan today is an unforgiving, untiring beast that never sleeps. chicagotribune.com, "The downfall of Pakistan's Nawaz Sharif and the triumph of stupidity," 4 Aug. 2017 Corrupt regimes long reviled by their populace are being brought down left and right, thanks to the brilliant and untiring efforts of democracy activists. Bruce Sterling, WIRED, "The Yes-Men enjoying the discomfiture of the US Chamber of Commerce," 16 Feb. 2011

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

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First Known Use of untiring

1822, in the meaning defined above

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The first known use of untiring was in 1822

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English Language Learners Definition of untiring

: working very hard with a lot of energy for a long time : never seeming to get tired


un·​tir·​ing | \ ˌən-ˈtī-riŋ How to pronounce untiring (audio) \

Kids Definition of untiring

: not becoming tired

More from Merriam-Webster on untiring

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Comments on untiring

What made you want to look up untiring? Please tell us where you read or heard it (including the quote, if possible).


to form ideas or theories about something

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