WordReference Random House Learner's Dictionary of American English © 2017
dumb•found /dʌmˈfaʊnd, ˈdʌmˌfaʊnd/USA pronunciation   v. [+ object]
  1. to make speechless with amazement:dumbfounded by all the damage done by the storm.

WordReference Random House Unabridged Dictionary of American English © 2017
dumb•found  (dum found, dumfound′),USA pronunciation v.t. 
  1. to make speechless with amazement;
Also,  dumb•founder.  dumb•founder•ment, n. 
  • dumb + (con)found 1645–55
    amaze, confound, astound, stagger.

Collins Concise English Dictionary © HarperCollins Publishers::

dumbfound, dumfound /dʌmˈfaʊnd/ vb
  1. (transitive) to strike dumb with astonishment; amaze
Etymology: 17th Century: from dumb + ( con) found

'dumbfounded' also found in these entries:

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