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.
Making an impact far beyond his artistic practice, Bechara was a tireless advocate for artists who risked marginalization. Natasha Gural, Forbes.com, 12 June 2025 Their incredible courage and persistence, combined with the tireless work of our negotiating committee, has at last secured a deal. Erik Hayden, HollywoodReporter, 11 June 2025 David’s tireless efforts and advocacy were instrumental in getting the opioid overdose reversal medication into the hands of police officers and other first responders in Florida and nationwide, equipping them with the tools and resources needed to save lives. Jackie Siegel, The Orlando Sentinel, 6 June 2025 There’s no way to count how many tireless individuals get stabbed, stomped, thrown against walls, or blitzed with automatic weapons. Stephanie Zacharek, Time, 6 June 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

Browse Nearby Words

Cite this Entry

“Tireless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tireless. Accessed 16 Jun. 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
Love words? Need even more definitions?

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