verb (used with object)
to overcome with surprise and bewilderment; astound.

1765–75; variant of flabagast (perhaps flabb(y) + aghast)

flabbergaster, noun

amaze, astonish, stagger, nonplus, confound; perplex, confuse, mystify.
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World English Dictionary
flabbergast (ˈflæbəˌɡɑːst)
informal to overcome with astonishment; amaze utterly; astound
[C18: of uncertain origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Entry one is offered in flabbergast that the lawyers have, finally, completely won.
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