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

Young was unflappable and unbeatable. —CBS News, 3 May 2026

Whether dealing with a death threat or trying to pass a bill with only minutes left in the legislative session, Looney is known for being unflappable. —Christopher Keating, Hartford Courant, 2 May 2026

But he was known also for an ever-ready smile, an unflappable temperament and unassuming demeanor, an ego-less willingness to pitch in to help other reporters on stories large and small, and a quirky sense of humor that lightened the stress of many a deadline. —Andres Viglucci, Miami Herald, 1 May 2026

But this is nowhere near a 2-2 stalemate in the best-of-seven series if not for the unflappable play of Wallstedt. —Joe Smith, New York Times, 26 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