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

Definition of tireless

: seemingly incapable of tiring : indefatigable a tireless worker

Keep scrolling for more

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

My first mentor at Gannett was Karen Magnuson, a tireless champion of diversity and a truth teller who never once pulled a punch, even when targeting diversity gaps in her own company. Greg Burton, azcentral, "From our executive editor: We're dedicated to improving newsroom diversity – and have the numbers to prove it," 30 June 2019 O’Brien received the American Platform Tennis Association Service Award in 2011 for being a tireless advocate for the game, which currently is played at dozens of clubs in the Chicago area and in hundreds of programs nationally, Brennan said. Kimberly Fornek, chicagotribune.com, "Hinsdale paddle tennis players want to name the KLM paddle hut after their most dedicated supporter," 23 June 2019 The influential German composer (1928-2007) was a tireless innovator, constantly striking out in... A.j. Goldmann, WSJ, "‘Aus LICHT’ Review: A Kaleidoscopic Production," 10 June 2019 Ever since Flaubert established the tireless quest for le mot juste as the signature feature of literary work, writers have rebelled against this conception of their art. Christopher Beha, Harper's magazine, "Mallo My!," 10 Mar. 2019 The hub of the gyroscopic story is Houghton Forster, who creates PanCola in his Mississippi pharmacy near the end of the 19th century and through tireless lobbying and clever branding raises it to international renown. Sam Sacks, WSJ, "Fiction: The Flavor of the American Century," 15 Feb. 2019 Your tireless commitment, discipline and hard work never ceases to amaze me. Erica Gonzales, Harper's BAZAAR, "Gisele Bündchen's Reaction to Tom Brady's Super Bowl Win Was Priceless," 4 Feb. 2019 But West Ham's Javier Hernandez impressed as well, displaying tireless energy and effort to help his side keep the 2014 champions at bay. SI.com, "West Ham Forward Talks Potential Napoli Move After Receiving Praise From Carlo Ancelotti," 18 June 2018 Bill’s passion for the arts was felt by all who knew him, and his warmth and tireless energy were undeniable. Mike Miller, PEOPLE.com, "Bill Paxton's Family Blames Surgeon Who Operated on Him and Hospital for Actor's Death at 61," 13 Feb. 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.

See More

First Known Use of tireless

1591, in the meaning defined above

Keep scrolling for more

Learn More about tireless

Dictionary Entries near tireless

tire chain


tire gage



tire of

tire press

Statistics for tireless

Last Updated

13 Jul 2019

Look-up Popularity

Time Traveler for tireless

The first known use of tireless was in 1591

See more words from the same year

Keep scrolling for more

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

Keep scrolling for more

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).


having no luck

Get Word of the Day daily email!

Test Your Vocabulary

What's that Smell?! Quiz

  • wide eyed dog smelling rose
  • Someone who is hircine smells like a:
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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