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flabbergast

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

1765–75; variant of flabagast (perhaps flabb(y) + aghast)
Related formsflab·ber·gast·er, noun

Synonyms

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amaze, astonish, stagger, nonplus, confound; perplex, confuse, mystify.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for flabbergaster

flabbergast

verb (tr)
  1. informal to overcome with astonishment; amaze utterly; astound
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Word Origin

C18: of uncertain origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012