im·​pla·​ca·​ble | \ (ˌ)im-ˈpla-kə-bəl How to pronounce implacable (audio) , -ˈplā- How to pronounce implacable (audio) \

Definition of implacable

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

Keep scrolling for more

Other Words from implacable

implacability \ (ˌ)im-​ˌpla-​kə-​ˈbi-​lə-​tē How to pronounce implacability (audio) , -​ˌplā-​ \ noun
implacably \ (ˌ)im-​ˈpla-​kə-​blē How to pronounce implacably (audio) , -​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 Whether the country follows the Democratic Party on its left turn largely depends on whether Warren or whoever the party picks as its standard-bearer can preserve some room to maneuver apart from the implacable demands of this faction. Washington Post, "The Democrats Are Moving Left. Will America Follow?," 12 Nov. 2019 Michael, meanwhile, is much more opaque, at least to the clueless Noah, although his occasional bedwetting and regular outbursts hint at the turmoil under his implacable exterior., "In “Akin,” the Dublin-born author once again pairs a child and a caregiver in uncomfortable proximity. Only this time, that closeness comes during a trip to Nice, France, and the awkwardness arises from the two being strangers, although they are, as the title suggests, related.," 26 Sep. 2019 The existence of ghettos is no longer enforced by implacable bigots. The Economist, "Half a century after Martin Luther King’s murder, America remains an unequal place," 4 Apr. 2018 Riven by feuding tribes and implacable warlords, the country had a volatile history of coups, assassinations and civil wars. Craig Whitlock, Anchorage Daily News, "Officials reveal how massive rebuilding projects in Afghanistan failed," 9 Dec. 2019 Garnett, during his playing days, liked to present himself as an implacable warrior. Kelefa Sanneh, The New Yorker, "The Safdie Brothers’ Full-Immersion Filmmaking," 9 Dec. 2019 As my long career unspooled, of course, Iran went from a U.S. ally to an implacable foe. James Stavridis, Time, "Despite the Pensacola Shooting, It's a Good Thing for U.S. to Train Foreign Militaries," 9 Dec. 2019 Republicans have been implacable in their determination to put an end to Obama’s proudest legislative achievement ever since it was passed in March 2010. The New York Review of Books, "Elizabeth Drew," 22 June 2017 Russia is, after all, a close ally of Saudi's most implacable foe -- Iran. Matthew Chance, CNN, "Putin is on a victory lap of the Middle East," 15 Oct. 2019

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.

See More

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

Keep scrolling for more

Learn More about implacable

Time Traveler for implacable

Time Traveler

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

See more words from the same century

Listen to Our Podcast about implacable

Statistics for implacable

Last Updated

14 Jan 2020

Cite this Entry

“Implacable.” The Dictionary, Merriam-Webster Inc., Accessed 19 January 2020.

Keep scrolling for more

More Definitions for implacable


How to pronounce implacable (audio) How to pronounce implacable (audio)

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 How to pronounce implacable (audio) , -ˈplā- \

Kids Definition of implacable

: impossible to please, satisfy, or change implacable enemies

Keep scrolling for more

Comments on implacable

What made you want to look up implacable? Please tell us where you read or heard it (including the quote, if possible).


to insert between existing elements

Get Word of the Day daily email!

Test Your Vocabulary

The Eponym Quiz

  • rubens painting
  • Which is the best synonym of bowdlerize?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!