adj ·Moderate ·High school level

Definitions

Adjective

1. 1
   Remaining composed and level-headed at all times; impossible to fluster; not becoming frustrated or irritated easily.

   "The whole thing looked remarkably like an implacable force meeting an unflappable object."

Adjective

1. 1
   not easily perturbed or excited or upset; marked by extreme calm and composure wordnet

Synonyms

All synonyms

collectedimperturbableadiaphroisticapatheticapathisticalassured

Antonyms

All antonyms

flappablefuribundinflammablepeevish

Example

More examples

"Tom's unflappable, even under great pressure."

Etymology

From un- + flap (“to upset, stir”) + -able.

Related phrases

level headed

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.