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 1995 film version of this exchange between Charlotte and Lizzy, in which the former is portrayed cooly by the unflappable Lucy Scott, challenges the audience’s ability to empathize with Charlotte’s pragmatism, and seems to encourage us to side with Elizabeth’s dismay. —Literary Hub, 9 Mar. 2026

Horschel consistently chatted up and down the fairways with playing partner Ryan Fox, an affable, unflappable 39-year-old New Zealander. —Edgar Thompson, The Orlando Sentinel, 5 Mar. 2026

His ability to remain unflappable has helped to maximize his potential. —Hunter Patterson, New York Times, 5 Mar. 2026

The former Christie’s auctioneer, author, podcaster and motivational speaker is normally unflappable on the podium. —Scarlett Harris, Los Angeles Times, 24 Feb. 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