from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To cause to be overcome with astonishment; astound. See Synonyms at surprise.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To astonish; to strike with wonder, esp. by extraordinary statements.

from The Century Dictionary and Cyclopedia

  • To overcome with confusion or bewilderment; astonish, with ludicrous effect; confound: as, the news completely flabbergasted him.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. overcome with amazement


Origin unknown.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Origin uncertain. Hotten says it is from Old English; Whitney and Smith suggests flabby or flap (strike) + gast (astonish)[2]; The Imperial Dictionary connects it with flabber (related to flap, to strike) + the root of aghast, and notes that flabagast may have been the root (to strike aghast)[3]; first documented as slang in 1772; [4] Cassell gives it as dialectical from Suffolk, from flap or flabby + aghast, possibly related to Scottish flabrigast (to boast) or flabrigastit (worn out with exertion)[5]; Smith relates it to flab (to quake) or flap (to make a flap over something) + Middle English agasten (to terrify), and relates it to aghast, ghastly and ghost[6] (Wiktionary)



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