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

Fudd wears the same cool, neutral expression in every scenario on the court, her demeanor unflappable to anyone on the outside looking in. —Emily Adams, Hartford Courant, 5 Feb. 2026

Sabalenka repeatedly looked at her box in frustration during the third set, while Rybakina was unflappable and made fewer errors in the big moments. —Lev Akabas, Sportico.com, 1 Feb. 2026

The clip soon inspired TikTok users to impersonate the owl’s unflappable aura. —Dani Di Placido, Forbes.com, 30 Jan. 2026

While that duality has tested Lynch in new ways, her unflappable confidence — now sharpened by a calculating, heel-leaning persona — has only elevated her swagger. —Carl Lamarre, Billboard, 26 Jan. 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