im·​per·​turb·​able | \ ˌim-pər-ˈtər-bə-bəl How to pronounce imperturbable (audio) \

Definition of imperturbable

: marked by extreme calm, impassivity, and steadiness : serene

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Other Words from imperturbable

imperturbability \ ˌim-​pər-​ˌtər-​bə-​ˈbi-​lə-​tē How to pronounce imperturbable (audio) \ noun
imperturbably \ ˌim-​pər-​ˈtər-​bə-​blē How to pronounce imperturbable (audio) \ adverb

Synonyms & Antonyms for imperturbable



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cool, composed, collected, unruffled, imperturbable, nonchalant mean free from agitation or excitement. cool may imply calmness, deliberateness, or dispassionateness. kept a cool head composed implies freedom from agitation as a result of self-discipline or a sedate disposition. the composed pianist gave a flawless concert collected implies a concentration of mind that eliminates distractions especially in moments of crisis. the nurse stayed calm and collected unruffled suggests apparent serenity and poise in the face of setbacks or in the midst of excitement. harried but unruffled imperturbable implies coolness or assurance even under severe provocation. the speaker remained imperturbable despite the heckling nonchalant stresses an easy coolness of manner or casualness that suggests indifference or unconcern. a nonchalant driver

Did You Know?

There is an interesting time lag between the appearance of "imperturbable" and its antonym, "perturbable." Although "imperturbable" is known to have existed since the middle of the 15th century, "perturbable" didn't show up in written English until 1800. The verb "perturb" (meaning "to disquiet" or "to throw into confusion") predates both "imperturbable" and "perturbable"; it has been part of English since the 14th century. All three words derive from Latin perturbare (also meaning "to throw into confusion"), which in turn comes from the combination of per- and turbare, which means "to disturb." Other relatives of "imperturbable" include "disturb" and "turbid."

Examples of imperturbable in a Sentence

Although he seems outwardly imperturbable, he can get very angry at times. the chef was absolutely imperturbable—even when the kitchen caught on fire
Recent Examples on the Web With a rounded abdomen defined in yellow, pink, purple and green, Evans’s naked figure gazes out at the viewer, dignified and imperturbable. Susan Delson, WSJ, "Artist Alice Neel Found Beauty in Her Neighborhood," 12 Mar. 2021 Robinson himself proved imperturbable during courtroom interrogations. Paula Larsson, Smithsonian Magazine, "The Great Canadian Polio Vaccine Heist of 1959," 24 Feb. 2021 Porcupines are fully armed, near-blind, and imperturbable. Jill Lepore, The New Yorker, "Is Staying In Staying Safe?," 31 Aug. 2020 Its demeanor at 146 mph is as imperturbable as any Mercedes. Barry Winfield, Car and Driver, "Tested: 1994 Bentley Turbo R Brings the Old World into the New," 7 July 2020 In his last public appearance in October 2018, Mubarak appeared as imperturbable as ever. Hatem Maher, ABC News, "Former president of Egypt Hosni Mubarak dies at 91," 25 Feb. 2020 Even more imperturbable was Charlie Watts, his steady, impeccable drive still undimmed after all these years. Marc Hirsh,, "At Gillette, there’s no stopping the Rolling Stones," 8 July 2019 Vile’s songs sound, on the one hand, like the work of someone who’s radically imperturbable, and deeply chill in temperament, like a guy gently strumming his guitar and taking it all in. John Adamian,, "Kurt Vile and the Violators playing College Street," 19 July 2019 The 37-year-old Buttigieg, meanwhile, has impressed voters with his imperturbable demeanor and thoughtful views on everything from cultural change to public service., "Troubling portents for Joe Biden, Bernie Sanders as 2020 Democratic presidential race heats up, new polls arrive," 10 June 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'imperturbable.' 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 imperturbable

15th century, in the meaning defined above

History and Etymology for imperturbable

Middle English, from Late Latin imperturbabilis, from Latin in- + perturbare to perturb

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

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Last Updated

18 Mar 2021

Cite this Entry

“Imperturbable.” Dictionary, Merriam-Webster, Accessed 11 May. 2021.

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More Definitions for imperturbable



English Language Learners Definition of imperturbable

formal : very calm : very hard to disturb or upset


im·​per·​turb·​able | \ ˌim-pər-ˈtər-bə-bəl How to pronounce imperturbable (audio) \

Kids Definition of imperturbable

: hard to disturb or upset : very calm an imperturbable teacher

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