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implacable

1 ENTRIES FOUND:
implacable /ɪmˈplækəbəl/ adjective
implacable
/ɪmˈplækəbəl/
adjective
Britannica Dictionary definition of IMPLACABLE
[more implacable; most implacable]
: opposed to someone or something in a very angry or determined way that cannot be changed

— implacably

/ɪmˈplækəbli/ adverb