Unflappable means so impossible to fluster that no emergency ever ruffles you. Utterly unflappable, an unflappable manner, unflappable under pressure.
It is high praise in any job where things go wrong, since an unflappable person keeps everybody else calm as well. The flap in it is the old slang for a panic, from birds beating their wings.
1adjectiveunflappableSo impossible to fluster that no emergency ever ruffles you.
“The unflappable pilot calmly landed the plane with only one engine working.”
unflappable is a quality.
Middle English
flap
English
flap
English, today
unflappable
Built from
From un- + flap + -able. flap comes from Middle English flap, flappe (“a slap; blow; buffet; fly-flap; something flexible or loose; flap”), related to stq Flappert (“wing, flipper”), Middle Dutch flabbe (“a blow; slap on the face; fly-flap; flap”) (modern Dutch flap (“flap”)), Middle Low German flabbe, vlabbe, flebbe, from the verb (see below). Related also to English flab and flabby.
Etymology from Wiktionary, CC BY-SA