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

Keep scrolling for more

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



Visit the Thesaurus for More 

Choose the Right Synonym for imperturbable

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 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 Porcupines are fully armed, near-blind, and imperturbable. Jill Lepore, The New Yorker, 31 Aug. 2020 Its demeanor at 146 mph is as imperturbable as any Mercedes. Barry Winfield, Car and Driver, 7 July 2020 In his last public appearance in October 2018, Mubarak appeared as imperturbable as ever. Hatem Maher, ABC News, 25 Feb. 2020 Even more imperturbable was Charlie Watts, his steady, impeccable drive still undimmed after all these years. Marc Hirsh,, 8 July 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.

See More

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

Keep scrolling for more

Learn More About imperturbable

Time Traveler for imperturbable

Time Traveler

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

See more words from the same century

Listen to Our Podcast About imperturbable

Statistics for imperturbable

Last Updated

22 Jun 2021

Cite this Entry

“Imperturbable.” Dictionary, Merriam-Webster, Accessed 27 Jul. 2021.

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

Keep scrolling for more

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

More from Merriam-Webster on imperturbable

Nglish: Translation of imperturbable for Spanish Speakers


Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
Spell It

Can you spell these 10 commonly misspelled words?

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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