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
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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
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