Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: implacabilis, from placabilis 'easily made calm'

implacable

 adjective
     
im‧plac‧a‧ble
very determined to continue opposing someone or something:
implacable enemies
The government faces implacable opposition on the issue of nuclear waste.
—implacably adverb:
He remained implacably opposed to Stalin's regime.
—implacability noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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