- The definition of unflappable is not easily flustered.
When you can deal with an unexpected storm and the caterer not showing up on your wedding day without getting upset, this is an example of when you would be described asunflappable.
Origin of unflappable; from un- + flap, + -able
(comparative more unflappable, superlative most unflappable)
- Remaining composed and level-headed at all times; unswayed by adversity or excitement; impossible to fluster; not becoming frustrated or irritated easily. [1954 to date]
- (remaining composed under pressure): flappable