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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 for flabbergast

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for flabbergasted

dumbfound, nonplus, disconcert, astound, amaze, astonish, daze, stun, overwhelm, shock, abash, confound, stagger, throw, overcome

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


  1. informal overcome with astonishment; amazed; astounded
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verb (tr)
  1. informal to overcome with astonishment; amaze utterly; astound
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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.

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Online Etymology Dictionary, © 2010 Douglas Harper