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Definition of flabbergasted
: feeling or showing intense shock, surprise, or wonder : utterly astonished
Every second person wore a blank flabbergasted expression, having just offered some gratuitous insult to a stranger, or, perhaps, received one.— Myles na Gopaleen (Flann O'Brien) That was the highlight of our career, when Vince Gill walked on stage one night and asked us to be the next members. We were flabbergasted, just speechless …— Steve Wildsmith But if the findings, published in 1996, surprised most scientists, recent research has left them flabbergasted.— Sandra Blakeslee
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Time Traveler for flabbergasted
The first known use of flabbergasted was in 1773
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