adj
implacable
ihm-PLA-kuhbl
adj
1
Unable to be calmed or satisfied; unrelenting in hostility or determination.
"He became an implacable enemy of the regime."
"Her implacable resolve never wavered, even under pressure."
How to Use Implacable
Learner’s notesIn plain EnglishSo determined or hostile that nothing will calm them down or change their mind.
Common pairings
implacable enemy
implacable opposition
implacable hatred
Word Forms
more implacable comparative, most implacable superlative
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He became an _____ enemy of the regime.
Etymology
From Latin implacabilis, from im- ("not") + placabilis ("able to be appeased").