indefatigable
Americanadjective
adjective
Other Word Forms
- indefatigability noun
- indefatigableness noun
- indefatigably adverb
Etymology
Origin of indefatigable
1580–90; < Latin indēfatīgābilis untiring, equivalent to in- in- 3 + dēfatīgā ( re ) to tire out ( de-, fatigue ) + -bilis -ble
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.
But an indefatigable Volkanovski's agility and relentless striking eventually wore down his flagging challenger, who was unable to land a knockout in the final round.
From Barron's • Feb. 1, 2026
It’s a rollicking animal story; it’s also a tale of indefatigable love.
From The Wall Street Journal • Nov. 7, 2025
It also said he was "indefatigable to the end" and "driven by relentless curiosity and a deep attention to the present and to people".
From BBC • Sep. 4, 2025
They deserve our support, as do a slew of writers, such as the indefatigable Heather Cox Richardson and Ruth Ben-Ghiat, who publish via Substack.
From Salon • Jul. 5, 2025
He turned away, shutting his eyes, but that was even worse, for now he had only the sounds, the tiny maddening, indefatigable, distinct clicks and rustles of hands and weightless parts.
From "Catch-22" by Joseph Heller
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.
