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[im-plak-uh-buhl, -pley-kuh-]
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  1. not to be appeased, mollified, or pacified; inexorable: an implacable enemy.
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Origin of implacable

First recorded in 1375–1425; late Middle English word from Latin word implācābilis. See im-2, placable
Related formsim·plac·a·bil·i·ty, im·plac·a·ble·ness, nounim·plac·a·bly, adverb

Synonyms for implacable

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for implacable

Contemporary Examples of implacable

Historical Examples of implacable

  • Peaceable Ambrose would have remonstrated, but Stephen was implacable.

    The Armourer's Prentices

    Charlotte M. Yonge

  • Else, could I hear the perpetual revilings of her implacable family?

    Clarissa, Volume 1 (of 9)

    Samuel Richardson

  • In a soliloquy he declares himself the implacable enemy of Cuzco and the Inca.

    Apu Ollantay


  • It was Karl Yundt who was heard, implacable to his last breath.

    The Secret Agent

    Joseph Conrad

  • The sky was hard, implacable, without a star, but all the same translucid.

    My Double Life

    Sarah Bernhardt

British Dictionary definitions for implacable


  1. incapable of being placated or pacified; unappeasable
  2. inflexible; intractable
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Derived Formsimplacability or implacableness, nounimplacably, adverb
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

Word Origin and History for implacable


early 15c., from Old French implacable, from Latin implacabilis "unappeasable," from assimilated form of in- "not, opposite of" (see in- (1)) + placabilis "easily appeased" (see placate). Related: Implacably.

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Online Etymology Dictionary, © 2010 Douglas Harper