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.
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
Alison-Madueke portrayed herself in court as a role model for women, a tireless fighter against corruption, and someone who was such a stickler for the rules she was nicknamed "Madam due process".
From BBC ● Jun. 17, 2026
The culmination of years of tireless work and financial stress for the Ambriz siblings is the breathtaking period fantasy “I Am Frankelda,” Mexico’s first-ever stop-motion feature, which is now streaming on Netflix.
From Los Angeles Times ● Jun. 15, 2026
After twenty-four hours of tireless work, Anthony went to the university trustees and presented $8,000 in pledges to make up the shortfall.
From "Votes for Women!" by Winifred Conkling
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.
