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

The rookie goalie has been unflappable over the past few months. —Pierre Lebrun, New York Times, 7 May 2026

Now, rather than fall in line with the stereotypical notions of Housewifedom, Rusch leans into her quirks and remains unflappable no matter what her castmates throw her way — from claiming her divorce was fraudulent to criticizing her potato salad. —Tom Smyth, Vulture, 6 May 2026

The service Friendly, unflappable, and with a casual ease that’s rare in hotels of this standard. —Condé Nast, Condé Nast Traveler, 6 May 2026

Young was unflappable and unbeatable. —CBS News, 3 May 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