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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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for implacableness

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
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Word Origin and History for implacableness

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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