imperturbable

adjective

im·​per·​turb·​able ˌim-pər-ˈtər-bə-bəl How to pronounce imperturbable (audio)
: marked by extreme calm, impassivity, and steadiness : serene
imperturbability noun
imperturbably adverb

Did you know?

Imperturbable is a bit of a mouthful, but don’t let its five syllables perturb you. Instead, let us break it down: this word, as well as its antonym perturbable, comes from the Latin verb perturbare, meaning "to agitate, trouble, or throw into confusion." Perturbare comes in turn from the combination of per-, meaning "thoroughly," and turbare, meaning "to disturb"; unsurprisingly perturbare is also the source of the English verb perturb. Other perturbare descendants include disturb ("to destroy the tranquility or composure of") and turbid ("thick or opaque with or as if with roiled sediment").

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

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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Valeska is the movie’s stabilizing presence, imperturbable even in the face of potential natural disaster. David Rooney, The Hollywood Reporter, 25 Feb. 2025 Standing in the rostrum of the House of Representatives, a gavel in her hand and a look of imperturbable stoicism on her face, Ms. Harris officiated as the two houses of Congress met in joint session to formally count the Electoral College votes for president. Peter Baker, New York Times, 6 Jan. 2025 The team’s droll, imperturbable manager, Dave Roberts, spent much of his summer issuing medical briefings on infirm pitchers. Nicholas Dawidoff, The New Yorker, 3 Nov. 2024 Minsky is the very opposite: chipper, imperturbable, and with impeccable manners. Jill Lepore, The New Yorker, 30 Sep. 2024 See All Example Sentences for imperturbable

Word History

Etymology

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

First Known Use

15th century, in the meaning defined above

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

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Cite this Entry

“Imperturbable.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/imperturbable. Accessed 10 Mar. 2025.

Kids Definition

imperturbable

adjective
im·​per·​turb·​able ˌim-pər-ˈtər-bə-bəl How to pronounce imperturbable (audio)
: hard to disturb or upset
imperturbability noun
imperturbably adverb

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