dumbfounder

English

Etymology 1

Verb

dumbfounder (third-person singular simple present dumbfounders, present participle dumbfoundering, simple past and past participle dumbfoundered)

1. (transitive) To dumbfound.

Etymology 2

dumbfound +‎ -er

Noun

dumbfounder (plural dumbfounders)

1. Someone who or that which dumbfounds.