indefatigable

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Definitions (5)

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  1. adjective Incapable or seemingly incapable of being fatigued; tireless. See Synonyms at tireless.

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Examples

  • Thus I passed a portion of the night; my professor was indefatigable, and, for my part, I was not weary of listening. —  Memoirs of Robert-Houdin
  • In his studies he has been indefatigable, and the result of those studies is a perfect knowledge of the philosophy of his art. —  Letters and Journals 01
  • His application was indefatigable, and his natural spirits capable of carrying him through any difficulty. —  The Lives of the Poets of Great Britain and Ireland
  • He is indefatigable, and I might say inexhaustible [sic], in his search for ear-splitting discords, forced transitions, harsh modulations, ugly distortions of melody and rhythm. —  Frederic Chopin as a Man and Musician
  • Joan of Arc was indefatigable, and with her keen eye sought out the likeliest place where an assault might be successfully carried; but she lacked troops for storming such strong outworks as Paris then had. —  Joan of Arc
 

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Indefatigable has been looked up 387 times, favorited 4 times, listed 79 times, and commented on 4 times.

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Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary. Copyright © 2003, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Etymologies (2)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. Obsolete French indéfatigable, from Latin indēfatīgābilis : in-, not; see in-1 + dēfatīgāre, to tire out (dē-, intensive pref.; see de- + fatīgāre, to weary).

Toggle Century etymologies Century Dictionary (1)

  1. = Old French indefatigable, from Latin indefatigabilis, that cannot be tired out, from in- privative + defatigabilis, that can be tired out: see defatigable.
 

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/ɪndəˈfætɪgəbl/
by American Heritage

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