[ flab-er-gast ]
/ ˈflæb ərˌgæst /
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See synonyms for: flabbergast / flabbergasted on Thesaurus.com

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

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

OTHER WORDS FROM flabbergast

flab·ber·gast·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use flabbergast in a sentence

  • Defense Department officials were “flabbergasted” at the criticism about the limited size of the initial National Guard presence, noting that they provided exactly what Bowser requested, according to a senior defense official.

    Capitol breach prompts urgent questions about security failures|Carol D. Leonnig, Aaron Davis, Dan Lamothe, David Fahrenthold|January 7, 2021|Washington Post
  • It's a flabbergasting coincidence, would make a cynic swear; but by Jove you've been reserved for good luck in the end.'

    Mrs. Severn, Vol. 1 (of 3)|Mary Elizabeth Carter
  • The trick lies in the tone-color—in the flabbergasting magic of the orchestration.

    Damn!|Henry Louis Mencken

British Dictionary definitions for flabbergast

/ (ˈflæbəˌɡɑːst) /

verb (tr)
informal to overcome with astonishment; amaze utterly; astound

Word Origin for flabbergast

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