implacable

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

not to be appeased, mollified, or pacified; inexorable: an implacable enemy.

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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British Dictionary definitions for implacably

implacable

adjective

incapable of being placated or pacified; unappeasable
inflexible; intractable
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.

Online Etymology Dictionary, © 2010 Douglas Harper