tireless

adjective

tire·​less ˈtī(-ə)r-ləs How to pronounce tireless (audio)
: seemingly incapable of tiring : indefatigable
a tireless worker
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
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.
By all accounts, Lillard is a tireless worker and the ultimate teammate. Mat Issa, Forbes.com, 18 July 2025 Despite the tireless nature of silicon, the company walked away with second place. ArsTechnica, 18 July 2025 Kawamura earned praise in Memphis for his steep work ethic and tireless disposition. Julia Poe, Chicago Tribune, 14 July 2025 Krauss also has a slew of other honors to ger credit — including 12 International Bluegrass Music Association Awards — as befits this singularly gifted singer, violinist, band leader and tireless champion of earthy American music. George Varga, San Diego Union-Tribune, 10 July 2025 See All Example Sentences for tireless

Word History

First Known Use

1591, in the meaning defined above

Time Traveler
The first known use of tireless was in 1591

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Cite this Entry

“Tireless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tireless. Accessed 22 Jul. 2025.

Kids Definition

tireless

adjective
tire·​less ˈtī(ə)r-ləs How to pronounce tireless (audio)
: seeming never to get tired
a tireless worker
tirelessly adverb

More from Merriam-Webster on tireless

Last Updated: - Updated example sentences
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