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

When leaders appear unflappable and unshakeable, everything downstream appears to operate that much better, so leaders project invincibility. —Julian Hayes Ii, Forbes.com, 23 May 2026

Myers nails the realistic teen who is a far cry from the unflappable Nancy Drew, screwing up plenty and often terrified of what she's gotten herself into. —Kevin Jacobsen, Entertainment Weekly, 22 May 2026

The usually unflappable Miller had already walked a batter after a successful ball-strike challenge from Muncy. —Katie Woo, New York Times, 20 May 2026

With favorites falling to the wayside all over the undulating greens at Aronimink Golf Club, the ever-unflappable Scheffler sits atop the leaderboard after the opening day’s golf in Philadelphia. —Thomas Schlachter, CNN Money, 15 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