implacable
adjective/ɪmˈplækəbəl/
Frequency rank: #18,538 of 20,003 in the WORDED list (wordfreq data)
Meaning
Unable to be appeased or pacified; relentless and unstoppable in hostility.
Example sentence
The hero faced implacable opposition from the villain, who refused every offer of peace.
Synonyms & related words
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