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

In the days after 9/11, the fear of what might come next beset famously unflappable Gotham. — Evan Simko-Bednarski, New York Daily News, 11 Sep. 2026

Casting Pattinson in the role leaves little to the imagination, as the IRL Hansen’s more equanimous, jovially unflappable, everyday demeanor is replaced here by someone who’s visibly diseased in the head from the very top. — Ryan Lattanzio, IndieWire, 5 Sep. 2026

Smart, funny, incisive, generous and, perhaps above all, unflappable. — Culture Critic, Los Angeles Times, 4 Sep. 2026

In this novel Amis is as unflappable as ever, and his dry humour and the dark undertone of the novel are exactly my taste. — Literary Hub, 2 Sep. 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