im·pla·ca·ble | \ (ˌ)im-ˈpla-kə-bəl , -ˈplā- \

Definition of implacable 

: not placable : not capable of being appeased, significantly changed, or mitigated an implacable enemy

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Other words from implacable

implacability \(ˌ)im-ˌpla-kə-ˈbi-lə-tē, -ˌplā- \ noun
implacably \(ˌ)im-ˈpla-kə-blē, -ˈplā- \ adverb

How Should You Use implacable?

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."

Examples of implacable in a Sentence

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

Recent Examples on the Web

Even when chaos and privation seem implacable, the human drive for dignity and validation abides. Erika P. Rodriguez, Smithsonian, "Photo of the day," 27 June 2018 By 1985, in one of the crueler ironies of the century, gay men had learned that the liberation of the libido, the casting-off of eons-old shame, had exposed them to an implacable, hitherto unknown virus. Michael Cunningham, New York Times, "Surviving AIDS, but at What Cost?," 25 June 2018 Among those involved in the movement to address Spain’s legacy of silence, Cantera gained a reputation as an implacable opponent. Matías Costa, Smithsonian, "The Battle Over the Memory of the Spanish Civil War," 28 June 2018 Also right: The clothes — Blanchett wears everything with implacable style even when Lou is dressing down. Ty Burr,, "‘Ocean’s 8’ is a different take on the bling ring," 6 June 2018 But those same kinds of implacable flows earlier this week are blamed for the destruction of at least 12 homes Sunday and Monday and left neighborhoods covered with up to 20 feet of new rock. Trevor Hughes, USA TODAY, "New evacuations ordered as fast-flowing Hawaii lava blocks major volcano escape route," 30 May 2018 Her implacable opposition to Mr Kuczynski helped topple him. The Economist, "Peru’s new president, Martín Vizcarra, explains his plans," 17 May 2018 On Saturday Night Live, veteran actor Robert de Niro portrays him as a tough, implacable prosecutor. Matt Ford, The New Republic, "Robert Mueller’s Most Important Accomplishment," 16 May 2018 Visually barren and somewhat enervated, the movie nevertheless has a powerful sense of implacable fate — Lang’s not least. J. Hoberman, New York Times, "Sam Fuller and Fritz Lang: Audacious Auteurs of Noir," 27 Apr. 2018

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.

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First Known Use of implacable

15th century, in the meaning defined above

History and Etymology for implacable

Middle English, from Latin implacabilis, from in- + placabilis placable

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Statistics for implacable

Last Updated

26 Aug 2018

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Time Traveler for implacable

The first known use of implacable was in the 15th century

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More Definitions for implacable



English Language Learners Definition of implacable

: opposed to someone or something in a very angry or determined way that cannot be changed


im·pla·ca·ble | \ im-ˈpla-kə-bəl , -ˈplā- \

Kids Definition of implacable

: impossible to please, satisfy, or change implacable enemies

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