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

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

What really surprised the rather unflappable ISS and Glass Lewis was a tax reimbursement of $334 million that swells the total payout to $886 million. —Jill Goldsmith, Deadline, 23 Apr. 2026

Wallstedt, who admitted to some pregame nerves, set the tone for the way things would go early, looking completely unflappable in the opening 20 minutes. —Jess Myers, Twin Cities, 19 Apr. 2026

Take the first steps towards your new self with unflappable confidence. —Tarot.com, Hartford Courant, 17 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