Definition of implacable
- an implacable enemy
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He has an implacable hatred for his political opponents.
an implacable judge who knew in his bones that the cover-up extended to the highest levels of government
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'implacable.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Implacable is based on the Latin verb placare, meaning "to calm" or "to soothe." It joins the negative im- to the root to describe something that cannot be calmed or soothed or altered. The root placare also gave us placate. You may ask, what about the similar-looking words placid and placebo? These words are related to implacable and placate, but not as closely as you might suspect. They come from the Latin verb placēre, a relative of placare that means "to please."
First Known Use: 15th centurySee Words from the same year
: opposed to someone or something in a very angry or determined way that cannot be changed
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