- to make speechless with amazement; astonish.
Also dumb·found·er, dum·found·er.
Origin of dumbfound
SynonymsSee more synonyms for dumbfound on Thesaurus.com
amaze, confound, astound, stagger.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for dumfounded
"You can see for yourself," he said grimly to the dumfounded magnate.Within the Law
Captain Price was so dumfounded that for a moment words failed him.An Encore
When that happened, the shock of it brought him abruptly to a dumfounded halt.Scaramouche
Frederick Augustus was so dumfounded, he could only grind his teeth.Secret Memoirs: The Story of Louise, Crown Princess
Henry W. Fischer
All this took place so rapidly that the chevalier was dumfounded.A Romance of the West Indies
- (tr) to strike dumb with astonishment; amaze
C17: from dumb + (con) found
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 dumfounded
Online Etymology Dictionary, © 2010 Douglas Harper