verb (used with object)
to overcome with surprise and bewilderment; astound.
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dumbfound, nonplus, disconcert, astound, amaze, astonish, daze, stun, overwhelm, shock, abash, confound, stagger, throw, overcome
Origin of flabbergast
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for flabbergasting
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