Synonyms of imperturbable

imperturbable

adjective

ˌim-pər-ˈtər-bə-bəl 

as in nonchalant

not easily panicked or upset

the chef was absolutely imperturbable—even when the kitchen caught on fire

Synonyms & Similar Words

• nonchalant
• calm
• serene
• unflappable
• composed
• unshakable
• nerveless
• cool
• collected
• unruffled
• unperturbed
• tranquil
• unshaken
• placid
• undisturbed
• unworried
• untroubled
• icy
• coolheaded
• steely
• self-possessed
• self-composed
• self-collected

Antonyms & Near Antonyms

• panicky
• perturbable
• nervous
• anxious
• troubled
• shakable
• perturbed
• uneasy
• uptight
• shaky
• upset
• tense
• jittery
• jumpy
• worried
• edgy
• nervy
• dithery
• het up
• aflutter
• hung up

Synonym Chooser

How is the word imperturbable different from other adjectives like it?

Some common synonyms of imperturbable are collected, composed, cool, nonchalant, and unruffled. While all these words mean "free from agitation or excitement," imperturbable implies coolness or assurance even under severe provocation.

the speaker remained imperturbable despite the heckling

In what contexts can collected take the place of imperturbable?

The words collected and imperturbable are synonyms, but do differ in nuance. Specifically, collected implies a concentration of mind that eliminates distractions especially in moments of crisis.

the nurse stayed calm and collected

When is composed a more appropriate choice than imperturbable?

Although the words composed and imperturbable have much in common, composed implies freedom from agitation as a result of self-discipline or a sedate disposition.

the composed pianist gave a flawless concert

When can cool be used instead of imperturbable?

In some situations, the words cool and imperturbable are roughly equivalent. However, cool may imply calmness, deliberateness, or dispassionateness.

kept a cool head

When is it sensible to use nonchalant instead of imperturbable?

While in some cases nearly identical to imperturbable, nonchalant stresses an easy coolness of manner or casualness that suggests indifference or unconcern.

a nonchalant driver

When could unruffled be used to replace imperturbable?

While the synonyms unruffled and imperturbable are close in meaning, unruffled suggests apparent serenity and poise in the face of setbacks or in the midst of excitement.

harried but unruffled

Example Sentences

Recent Examples of imperturbable

But the Brits love to check an American’s imperturbable optimism. — Rafaela Bassili, Vulture, 3 Dec. 2025

This low-volatility ascent since April quite resembles the imperturbable rally through all of 2017. — Michael Santoli, CNBC, 25 Oct. 2025

Valeska is the movie’s stabilizing presence, imperturbable even in the face of potential natural disaster. — David Rooney, The Hollywood Reporter, 25 Feb. 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

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