tireless
Americanadjective
adjective
Other Word Forms
Etymology
Origin of tireless
Explanation
Someone who's tireless seems to never run out of energy. A tireless student will stay up late to make sure her paper is perfect; a tired student will just go to sleep. Your tireless efforts might be just what your friend's campaign for student council president needs—you're energetic and enthusiastic, and you'll focus on the campaign unflaggingly. Another way to say tireless is indefatigable. Tireless etymologists have determined that both adjectives date from the 16th century.
Vocabulary lists containing tireless
"A Noiseless Patient Spider" by Walt Whitman
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Because of Mr. Terupt
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Pre-AP Theatre
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“France is called to remain a tireless champion of peace and multilateralism, particularly within our beloved Europe,” he said.
From The Wall Street Journal ● Sep. 26, 2026
"She brought joy to millions through her many much-loved roles in sitcom and drama. She will also be remembered for her tireless work supporting mental health charities."
From BBC ● Sep. 18, 2026
He’s a risk-taker, a hard-driving boss and a tireless worker.
From The Wall Street Journal ● Sep. 16, 2026
And it’s not the only group doing this kind of tireless work.
From Los Angeles Times ● Sep. 8, 2026
But the mules were surefooted and tireless, and Mya Stone did indeed seem blessed with night-eyes.
From "A Game of Thrones" by George R.R. Martin
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Get a wordDefinitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
