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.
Wince as they perform complicated operations; get sucked into the personal trials of the tireless staff.
From The Wall Street Journal ● Jul. 8, 2026
When Stokes was involved - at the crease, or launching himself into another tireless spell - there was hope.
From BBC ● Jun. 29, 2026
I have never doubted the tireless efforts of those who work the elections.
From Salon ● Jun. 26, 2026
Araghchi in his X post gave credit to "tireless Pakistani and Qatari mediation".
From Barron's ● Jun. 22, 2026
Katz for his part clearly dreaded her company and winced beneath her tireless urgings to smarten his pace.
From "A Walk in the Woods" by Bill Bryson
Definitions 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.
