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
Instead, Alfonzo’s first appearance, the culmination of nine tireless years, was somber in the Dodgers’ 5-2 loss to the Padres.
From Los Angeles Times ● Jul. 6, 2026
She added: "This change is thanks to the tireless efforts of Helen and Peter Blythe, who have turned unimaginable tragedy into lasting change that will protect thousands of children for generations to come."
From BBC ● Jul. 5, 2026
"Lobga was a tireless advocate for Tibet who devoted himself to peacefully raising awareness of the human rights crisis in Tibet," Gyatso said in a statement to AFP.
From Barron's ● Jul. 3, 2026
Roosevelt was tireless in his hunt for one.
From "Death on the River of Doubt" by Samantha Seiple
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.
