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implacable

[im-plak-uh-buh l, -pley-kuh-] /ɪmˈplæk ə bəl, -ˈpleɪ kə-/
adjective
1.
not to be appeased, mollified, or pacified; inexorable:
an implacable enemy.
Origin
late Middle English
1375-1425
1375-1425; late Middle English < Latin implācābilis. See im-2, placable
Related forms
implacability, implacableness, noun
implacably, adverb
Synonyms
unappeasable, unbending, merciless. See inflexible.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for implacability

implacable

/ɪmˈplækəbəl/
adjective
1.
incapable of being placated or pacified; unappeasable
2.
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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Word Origin and History for implacability
n.

1530s, from Late Latin implacabilitas, from Latin implacabilis (see implacable).

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
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