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implacable (adj.)

"unappeasable," 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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Definitions of implacable

implacable (adj.)
incapable of being placated;
an implacable enemy
From wordnet.princeton.edu