dumb·found

[duhm-found, duhm-found]
verb (used with object)
to make speechless with amazement; astonish.
Also, dumb·found·er.


Origin:
1645–55; dumb + (con)found

dumb·found·er·ment, noun


amaze, confound, astound, stagger.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
dumbfound or dumfound (dʌmˈfaʊnd) [Click for IPA pronunciation guide]
 
vb
(tr) to strike dumb with astonishment; amaze
 
[C17: from dumb + (con)found]
 
dumfound or dumfound
 
vb
 
[C17: from dumb + (con)found]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Dumbfounded is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a fool or simpleton; ninny.
Etymonline
Word Origin & History

dumbfound
1650s, from dumb (q.v.) + (con)found.

dumbfounded
pp. adj. from dumbfound.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She was dumbfounded by the placement of the washer-dryer closet in a corner of
  the living room.
That leaves us dumbfounded.
All of them were dumbfounded and couldn't mutter much of a response.
Other guests seemed dumbfounded by the sight of the dealers.
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