verb (used with object)

to overcome with surprise and bewilderment; astound.

Origin of flabbergast

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

Synonyms for flabbergast

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for flabbergasted

Contemporary Examples of flabbergasted

Historical Examples of flabbergasted

  • If ever a poor devil was flabbergasted, it was the head of the Boyne agency at that moment.

  • And when he hears what's been goin' on, he's the most flabbergasted sailor man I ever saw.

    Shorty McCabe

    Sewell Ford

  • Hilton smiled at the flabbergasted captain and went back to the lounge.

    Masters of Space

    Edward Elmer Smith

  • I still don't know what was on the cart because I was too flabbergasted to notice it.

    Highways in Hiding

    George Oliver Smith

  • “I only wanted to see the library,” stuttered Trix, flabbergasted, dismayed.

British Dictionary definitions for flabbergasted



informal overcome with astonishment; amazed; astounded


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

Word Origin and History for 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