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[im-plak-uh-buh l, -pley-kuh-] /ɪmˈplæk ə bəl, -ˈpleɪ kə-/
not to be appeased, mollified, or pacified; inexorable:
an implacable enemy.
Origin of implacable
late Middle English
First recorded in 1375-1425; late Middle English word from Latin word implācābilis. See im-2, placable
Related forms
implacability, implacableness, noun
implacably, adverb
unappeasable, unbending, merciless. See inflexible. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for implacable
Contemporary Examples
Historical Examples
  • 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 Anonymous
  • 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


incapable of being placated or pacified; unappeasable
inflexible; intractable
Derived Forms
implacability, implacableness, noun
implacably, 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
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Contemporary definitions for implacable

unable to be appeased; irreconcilable

Word Origin

Latin im- + placare 'to appease''s 21st Century Lexicon
Copyright © 2003-2014, LLC
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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