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.
Over the years, Vucic has cultivated the image of a tireless leader criss-crossing Serbia, attracting investment and creating jobs.
From Barron's ● Sep. 27, 2026
“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
Only three years before he joined Leicester City in 2015, the tireless midfielder was turning out in his country's third tier.
From BBC ● Sep. 3, 2026
Spain's royal family hailed King Harald as an "example of responsibility, dignity, simplicity, and tireless dedication to the service" of his country.
From Barron's ● Aug. 28, 2026
In Chicago, despite the tireless efforts of his young lieutenant Harry Codman, the work was far behind schedule, the task ahead growing more enormous by the day.
From "The Devil in the White City" by Erik Larson
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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.
