WordReference Random House Learner's Dictionary of American English © 2015
dumb•found /dʌmˈfaʊnd, ˈdʌmˌfaʊnd/USA pronunciation v. [+ object]

    to make speechless with amazement:dumbfounded by all the damage done by the storm.


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



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