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

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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 And the flexibility of the imperturbable Audi mill allows a fifth-gear drive from near idle to redline, a trait reminiscent of the early Lamborghini GTs and one which makes the Spyker a pussycat to drive around town. Robert Ross, Robb Report, 20 Sep. 2021 The Emmy winner stars as Del Harris, the imperturbable police chief in the languishing Rust Belt town of Buell, Pennsylvania. Ew Staff,, 10 Sep. 2021 The slow movement was infused with an imperturbable serenity, perhaps the single most elusive state to achieve in the Hollywood Bowl. Los Angeles Times, 21 Aug. 2021 And, alone among the leading founders, the great imperturbable James Madison thought the country would likely do just fine. Barton Swaim, WSJ, 2 July 2021 But Wilson is like an imperturbable boulder in the middle of a rushing river. Kathryn Vanarendonk, Vulture, 8 June 2021 Whether dressed up with a shirt and tie or worn with imperturbable casual flair. Joseph Deacetis, Forbes, 5 May 2021 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, 12 Mar. 2021 Robinson himself proved imperturbable during courtroom interrogations. Paula Larsson, Smithsonian Magazine, 24 Feb. 2021

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

26 Sep 2021

Cite this Entry

“Imperturbable.” Dictionary, Merriam-Webster, Accessed 26 Sep. 2021.

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More Definitions for imperturbable



English Language Learners Definition of imperturbable

: 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

More from Merriam-Webster on imperturbable

Nglish: Translation of imperturbable for Spanish Speakers


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