IMPERTURBABLE Synonyms: 45 Similar and Opposite Words

Q: 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

Q: 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

Q: 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

Q: 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

Q: 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

Q: 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

imperturbable

adjective

ˌim-pər-ˈtər-bə-bəl

Definition of imperturbable

as in nonchalant

not easily panicked or upset the chef was absolutely imperturbable—even when the kitchen caught on fire

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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

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.

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 See All Example Sentences for imperturbable

Recent Examples of Synonyms for imperturbable

Adjective

The plan is to keep being nonchalant about the whole thing, and hopefully their fan base will continue to grow.

— Julius Miller, Los Angeles Times, 14 Aug. 2026
Opting for a baggier jean style immediately reads more nonchalant, giving the overall outfit a cooler look.

— Eva Thomas, InStyle, 12 Aug. 2026

Definition of nonchalant

Adjective

Mood stabilizers influence brain receptors that release and maintain neurotransmitters, calm overactive circuits and strengthen cellular connections over time.

— Jen Christensen, CNN Money, 29 Aug. 2026
As a priest, Lamb held a calm, patient and somewhat self-deprecating sense of perspective.

— Graham Womack, Sacbee.com, 29 Aug. 2026

Definition of calm

Adjective

Many of the victims were young, and many were farmers who had lived in what was once considered one of the most serene and safest areas of the region, which includes metropolitan Port-au-Prince.

— Jacqueline Charles, Miami Herald, 24 Aug. 2026
There’s no unwinding in the serene nature and crisp German air of Baden-Baden, the historic town long associated with restorative living, and that seamless discretion is entirely the point.

— Abby Montanez, Robb Report, 23 Aug. 2026

Definition of serene

Adjective

Behind them, manning the decks, was Margo XS, unflappable in her wraparound shades.

— Walden Green, Pitchfork, 30 July 2026
Why The Executive Playbook Has To Change The typical model for high-achieving leaders is to out-suffer everyone else in the room, appear unflappable, stay silent on struggles, and be the first one in and last one out.

— Julian Hayes II, Forbes.com, 25 July 2026

Definition of unflappable

Adjective

The book’s post-apocalyptic setting ennobles its meditations on selfhood and finitude; the narrator’s search for perpetuity is lent an unshakable gravity by her circumstances.

— Katy Waldman, New Yorker, 3 Aug. 2026
No one expected Joint to suddenly start serving like Williams or possess her unshakable self-confidence.

— Charlie Eccleshare, New York Times, 30 June 2026

Definition of unshakable

Adjective

Ismael Saibari — Morocco/Bayern Munich (+1) Marked his first match since leaving PSV for Bayern Munich by sending the Netherlands home with a nerveless penalty to win the shootout.

— Liam Twomey, New York Times, 4 July 2026
As did the nerveless manner in which the striker — who turns 38 in March — sent goalkeeper Harry Tyrer the wrong way from the spot to clinch another three points.

— Richard Sutcliffe, The Athletic, 9 Jan. 2025

Definition of nerveless

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“Imperturbable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/imperturbable. Accessed 2 Sep. 2026.

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Synonyms of imperturbable

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