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implacable

[im-plak-uh-buhl, -pley-kuh-]
adjective
  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

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

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British Dictionary definitions for implacably

implacable

adjective
  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 implacably

implacable

adj.

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