He was flabbergasted to find that his work had been done for him before he began.
Her stupidity flabbergasts me, and I have to force myself to keep a straight face while she explains her beliefs.
I love to flabbergast the little-minded by shattering their preconceptions about my nationality and gender.
The oddity of the situation was so flabbergasting I couldn't react in time for anyone to see it.
When you make a very surprising announcement that leaves all others stunned, this is an example of a situation where you flabbergast the listeners.
Origin of flabbergast
- Origin unknown
From American Heritage Dictionary of the English Language, 5th Edition
- Origin uncertain. Hotten says it is from Old English; Whitney and Smith suggests flabby or flap (strike) + gast (astonish); The Imperial Dictionary connects it with flabber (related to flap, to strike) + the root of aghast, and notes that flabagast may have been the root (to strike aghast); first documented as slang in 1772; Cassell gives it as dialectical from Suffolk, from flap or flabby + aghast, possibly related to Scottish flabrigast (to boast) or flabrigastit (worn out with exertion); Smith relates it to flab (to quake) or flap (to make a flap over something) + Middle English agasten (to terrify), and relates it to aghast, ghastly and ghost