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Synonyms

indefatigable

American  
[in-di-fat-i-guh-buhl] / ˌɪn dɪˈfæt ɪ gə bəl /

adjective

  1. incapable of being tired out; not yielding to fatigue; untiring.

    Synonyms:
    persevering, inexhaustible, tireless

indefatigable British  
/ ˌɪndɪˈfætɪɡəbəl /

adjective

  1. unable to be tired out; unflagging

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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

The thrill of seeing a fearless, indefatigable performer single-handedly populate the stage with the myriad figures of this masterwork never lets up.

From Los Angeles Times

That’s appropriate, given that this is the 20th anniversary of Beth Morrison Projects, whose principal is the pioneering co-founder and now sole producer of Prototype, and an indefatigable champion of new, unconventional operas.

From The Wall Street Journal

It’s a rollicking animal story; it’s also a tale of indefatigable love.

From The Wall Street Journal

Underlings have long marveled at his indefatigable work ethic.

From Los Angeles Times