flab·ber·gast

[flab-er-gast]
verb (used with object)
to overcome with surprise and bewilderment; astound.

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

flab·ber·gast·er, noun


amaze, astonish, stagger, nonplus, confound; perplex, confuse, mystify.
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flabbergast (ˈflæbəˌɡɑːst) [Click for IPA pronunciation guide]
 
vb
informal to overcome with astonishment; amaze utterly; astound
 
[C18: of uncertain origin]

00:10
Flabbergasted is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a chattering or flighty, light-headed person.
flabbergasted (ˈflæbəˌɡɑːstɪd) [Click for IPA pronunciation guide]
 
adj
informal overcome with astonishment; amazed; astounded

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

flabbergasted
1772, mentioned (with bored) in a magazine article as a new vogue word, perhaps from some dialect (in 1823 flabbergast was noted as a Sussex word), likely an arbitrary formation from flabby or flapper and aghast.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The food prep people seem equally flabbergasted in trying to whip up the
  concoctions people have requested.
We were flabbergasted when the echocardiogram results came in that afternoon.
He was absolutely flabbergasted to find out what those transcripts that he
  requested were costing people.
And many visitors are flabbergasted at first, even if they warm up to it later.
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