tire·​less | \ ˈtī(-ə)r-ləs How to pronounce tireless (audio) \

Definition of tireless

: seemingly incapable of tiring : indefatigable a tireless worker

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Other Words from tireless

tirelessly adverb
tirelessness noun

Examples of tireless in a Sentence

She has been a tireless advocate for reform. a tireless advocate for human rights

Recent Examples on the Web

Former Vice President Al Gore continues his tireless fight, traveling around the world to train an army of activists and influence international climate policy. Los Angeles Times, "Movies on TV this week Sept. 1 - 7, 2019: John Wayne in ‘The Searchers’ and more," 30 Aug. 2019 Her tireless energy was spent by actively supporting College Park United Methodist Church; bake sales, church supported dinners, raising funds and providing for various causes and charities. orlandosentinel.com, "Deaths in Central Florida: 8/29," 29 Aug. 2019 Rosa Parks solidified her place in American history through her tireless civil rights work and nonviolent resistance, and this week, toy company Mattel recognized her status as an icon with the launch of a doll in her likeness. Tanya A. Christian, Essence, "Barbie Launches New Rosa Parks Doll," 28 Aug. 2019 After tireless efforts by fire crews from Alaska and the Lower 48, evacuated Fairbanks residents received an all-clear on July 10. Nancy Fresco, The Conversation, "Huge wildfires in the Arctic and far North send a planetary warning," 14 Aug. 2019 The Portugal international was tireless last season for City, setting the tempo for the rest of the team. SI.com, "Liverpool vs Man City: Picking a Combined XI Ahead of Sunday's FA Community Shield," 2 Aug. 2019 Mother Jones writer Kevin Drum has been tireless in collating the vast pile of evidence regarding the link. Noah Smith, Twin Cities, "Noah Smith: Clean up lead before it wrecks more American lives," 21 July 2019 David received the Oliver Gaudreau Award in 2016 in recognition of his tireless work to benefit the Club and its members. courant.com, "David R. Kushlan," 12 June 2019 The two chatted about everything from motherhood after #MeToo to politics and Stone's tireless work in HIV/AIDS activism. Amanda Mitchell, Marie Claire, "Sharon Stone on Being a Mom to Sons in a Post-MeToo World," 16 Oct. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'tireless.' 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 tireless

1591, in the meaning defined above

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Dictionary Entries near tireless

tire chain


tire gage



tire of

tire press

Statistics for tireless

Last Updated

7 Sep 2019

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Time Traveler for tireless

The first known use of tireless was in 1591

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More Definitions for tireless



English Language Learners Definition of tireless

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


tire·​less | \ ˈtīr-ləs How to pronounce tireless (audio) \

Kids Definition of tireless

: able to work or persist a long time without becoming tired

Other Words from tireless

tirelessly adverb

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More from Merriam-Webster on tireless

Rhyming Dictionary: Words that rhyme with tireless

Thesaurus: All synonyms and antonyms for tireless

Spanish Central: Translation of tireless

Nglish: Translation of tireless for Spanish Speakers

Britannica English: Translation of tireless for Arabic Speakers

Comments on tireless

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


concealment of treason or felony

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