tireless
adjective
tire·less
ˈtī(-ə)r-ləs 
: 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
Both are wicked smart brainiacs on a tireless quest to do good in the world.
—
Natasha Stoynoff, PEOPLE, 7 Sep. 2025
According to sources at Valdebebas, the teenager has impressed with his energy, tireless running, constant offering for the ball and strong personality.
—Mario Cortegana, New York Times, 5 Sep. 2025
Matzner’s philanthropy extended to his tireless service on nonprofit boards, his insistence on accountability and his gift for rallying others to join him in giving.
—Erik Pedersen, Deadline, 4 Sep. 2025
We’re expected to be the calm in the storm, the tireless energy behind the team, the role model of relentless commitment.
—Yermys Pena, Forbes.com, 3 Sep. 2025
See All Example Sentences for tireless
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Natasha Stoynoff, PEOPLE, 7 Sep. 2025
According to sources at Valdebebas, the teenager has impressed with his energy, tireless running, constant offering for the ball and strong personality.
—Mario Cortegana, New York Times, 5 Sep. 2025
Matzner’s philanthropy extended to his tireless service on nonprofit boards, his insistence on accountability and his gift for rallying others to join him in giving.
—Erik Pedersen, Deadline, 4 Sep. 2025
We’re expected to be the calm in the storm, the tireless energy behind the team, the role model of relentless commitment.
—Yermys Pena, Forbes.com, 3 Sep. 2025
See All Example Sentences for tireless
Cite this Entry
“Tireless.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tireless. Accessed 9 Sep. 2025.
Copy CitationKids Definition
tireless
adjective
tire·less
ˈtī(ə)r-ləs
: seeming never to get tired
a tireless worker
tirelessly
adverb
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