Implacable
/ˌɪˈmplækəbəl/
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Definition
(adj) Not able to be placated or appeased.
Sentence Examples
I cannot understand the implacable hatred that he still feels for his old rival.
The man acquiesced, but the woman remained implacable.
CEFR Practice Quiz
The two families remained ____ enemies for many years after the initial dispute over the land.