Cool
Cool adjective - Free from emotional or mental agitation.
Usage example: in a crisis keep a cool head, even if no one else is
Unflappable is a synonym for cool in calm topic. In some cases you can use "Unflappable" instead an adjective "Cool". informal substitute
Unflappable
Unflappable adjective - Not easily panicked or upset.
Usage example: the unflappable teacher never even blinked when the wall map came crashing down
Cool is a synonym for unflappable in calm topic. You can use "Cool" instead the word "Unflappable" as an adjective or a noun, if it concerns topics such as imperturbable. popular alternative
Mutual synonyms
Both words in one sentence
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Albert appears perpetually cool and unflappable, no matter how intimidating the situation.
Source: Comic Book / Damage Control -
Berserk Button: Normally, Al is cool and unflappable during his missions.
Source: Series / It Takes a Thief (1968) -
Here, he is largely unflappable with just the right tools for the job and a pretty cool base of operations.Arthur: [sotto voce] Who knew Sewer Urchin of all people would be this cool?
Source: Western Animation / The Tick
Cite this Source
Unflappable and Cool. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/cool/unflappable
Cool & Unflappable. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/cool/unflappable>.
Unflappable or Cool. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/cool/unflappable.
Google Ngram Viewer shows how "cool" and "unflappable" have occurred on timeline