- to overcome with surprise and bewilderment; astound.
Origin of flabbergast
SynonymsSee more synonyms on Thesaurus.com
amaze, astonish, stagger, nonplus, confound; perplex, confuse, mystify.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- informal to overcome with astonishment; amaze utterly; astound
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