unflappable

adjective

un·​flap·​pa·​ble ˌən-ˈfla-pə-bəl 

: marked by assurance and self-control

has a reputation for being unflappable even in the worst situations

unflappability

ˌən-ˌfla-pə-ˈbi-lə-tē 

noun

unflappably

ˌən-ˈfla-pə-blē 

adverb

Synonyms of unflappable

• nonchalant
• calm
• imperturbable
• serene
• unshakable
• composed
• nerveless

Examples of unflappable in a Sentence

He has a reputation for being unflappable.

the unflappable teacher never even blinked when the wall map came crashing down

Recent Examples on the Web

Wallstedt, who admitted to some pregame nerves, set the tone for the way things would go early, looking completely unflappable in the opening 20 minutes. —Jess Myers, Twin Cities, 19 Apr. 2026

Take the first steps towards your new self with unflappable confidence. —Tarot.com, Hartford Courant, 17 Apr. 2026

Cher, our stand-in for Emma Woodhouse, is the it-girl at the center of it all, confident and unflappable in her place in the hierarchy—but with a hint of narcissism that gives her a preening over-confidence in her capabilities. —Literary Hub, 15 Apr. 2026

Through pressure and attention, success, struggle, uncertainty and a wide array of first-time experiences, McGonigle has been unflappable and collected, professional and mature beyond his 21 years. —Cody Stavenhagen, New York Times, 15 Apr. 2026

Word History

Etymology

un- entry 1 + flap entry 1 (state of excitement) + -able

First Known Use

1954, in the meaning defined above

Kids Definition

unflappable

adjective

un·​flap·​pa·​ble ˌən-ˈflap-ə-bəl 

: not easily upset or panicked : unusually calm