dumbfounder
English
Verb
dumbfounder (third-person singular simple present dumbfounders, present participle dumbfoundering, simple past and past participle dumbfoundered)
- (transitive) To dumbfound.
Etymology 2
dumbfound + -er
Noun
dumbfounder (plural dumbfounders)
- Someone who or that which dumbfounds.