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 implacable (audio) , -​ˌplā-​ \ noun
implacably \ (ˌ)im-​ˈpla-​kə-​blē How to pronounce implacable (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 From that day forward, Margaret became her fiercest critic and most implacable opponent. Andrew Morton, Town & Country, "Inside Princess Margaret's Complicated Relationship with Princess Diana," 30 Mar. 2021 Activism and finance may seem an unlikely pairing of two implacable foes. The Christian Science Monitor, "Why some climate scientists are joining the finance industry," 15 Apr. 2021 The reader will surely need this teasing authorial doubleness, as a brace against an implacable darkening. James Wood, The New Yorker, "A Family at Odds Reveals a Nation in the Throes," 12 Apr. 2021 For three decades, Wayne LaPierre has been the implacable face of the gun lobby, a scourge of the left who argued that giving ground on gun control was akin to giving up on America. New York Times, "N.R.A. Chief Takes the Stand, With Cracks in His Armor," 11 Apr. 2021 Black-clad and implacable, she’s filmed almost like an avenging angel. Bilge Ebiri, Vulture, "The First Masterpiece of 2021 Is Here," 7 Apr. 2021 There should be a kind of liberation in this implacable hatred. Fintan O’toole, The New York Review of Books, "To Hell with Unity," 2 Mar. 2021 The social contract in the corporation was seen as heartless and implacable. Dennis Jaffe, Forbes, "From Shareholder Primacy To Stakeholder Primacy: How Family Businesses Lead The Way," 24 Feb. 2021 The letter from the Law Department urged for Javier’s release, but ICE has remained implacable. Eric Lach, The New Yorker, "A Deportation Nightmare in the Bronx," 28 Feb. 2021

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

4 May 2021

Cite this Entry

“Implacable.” Dictionary, Merriam-Webster, Accessed 12 May. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

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

Kids Definition of implacable

: impossible to please, satisfy, or change implacable enemies

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).


Test Your Vocabulary

Star Wars Words Quiz

  • cu jedi training
  • The bounty portion of bounty hunters (such as Boba Fett) comes from a Latin word meaning
Spell It

Can you spell these 10 commonly misspelled words?


Anagram puzzles meet word search.

Love words? Need even more definitions?

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