Implacable | Definition of implacable by Merriam-Webster

Full Definition of IMPLACABLE

: not placable : not capable of being appeased, significantly changed, or mitigated <an implacable enemy>

— im·pla·ca·bil·i·ty \-ˌpla-kə-ˈbi-lə-tē, -ˌplā-\ noun

— im·pla·ca·bly \-ˈpla-kə-blē, -ˈplā-\ adverb

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Middle English, from Latin implacabilis, from in- + placabilis placable

First Known Use: 15th century

Synonyms: adamant, adamantine, bullheaded, dogged, hard, hardened, hardheaded, hard-nosed, headstrong, immovable, obstinate, inconvincible, inflexible, intransigent, mulish, obdurate, opinionated, ossified, pat, pertinacious, perverse, pigheaded, self-opinionated, self-willed, stiff-necked, stubborn, unbending, uncompromising, unrelenting, unyielding, willful (or wilful)

Antonyms: acquiescent, agreeable, amenable, compliant, complying, flexible, pliable, pliant, relenting, yielding

: impossible to please, satisfy, or change <implacable enemies>

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