Definition of dumbfound verb from the Oxford Advanced Learner's Dictionary

 

dumbfound

 verb
verb
BrE BrE//dʌmˈfaʊnd//
 
; NAmE NAmE//dʌmˈfaʊnd//
 
Verb Forms present simple I / you / we / they dumbfound
BrE BrE//dʌmˈfaʊnd//
 
; NAmE NAmE//dʌmˈfaʊnd//
 
he / she / it dumbfounds
BrE BrE//dʌmˈfaʊndz//
 
; NAmE NAmE//dʌmˈfaʊndz//
 
past simple dumbfounded
BrE BrE//dʌmˈfaʊndɪd//
 
; NAmE NAmE//dʌmˈfaʊndɪd//
 
past participle dumbfounded
BrE BrE//dʌmˈfaʊndɪd//
 
; NAmE NAmE//dʌmˈfaʊndɪd//
 
-ing form dumbfounding
BrE BrE//dʌmˈfaʊndɪŋ//
 
; NAmE NAmE//dʌmˈfaʊndɪŋ//
 
Surprise
 
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dumbfound somebody to surprise or shock somebody so much that they are unable to speak His reply dumbfounded me. See related entries: Surprise
See the Oxford Advanced American Dictionary entry: dumbfound