Definition of dumbfound verb from the Oxford Advanced American Dictionary

 

dumbfound

 verb
verb
NAmE//ˈdʌmfaʊnd//
 
, NAmE//dʌmˈfaʊnd//
 
dumbfound somebodyVerb Forms present simple I / you / we / they dumbfound
 
he / she / it dumbfounds
 
past simple dumbfounded
 
-ing form dumbfounding
 
 
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to surprise or shock someone so much that they are unable to speak His reply dumbfounded me.
See the Oxford Advanced Learner's Dictionary entry: dumbfound