past form
Surprised someone so much that they did not know what to say or think.
The news dumbfounded everyone in the room.
Their generosity dumbfounded her.
American English
How to pronounce dumbfounded
verb · adjectiveB2
DUHMfowndihd
/ˈdəm.faʊn.dɪd̚/
3 syllables · Stress the first syllable.
Form of dumbfound
Dumbfounded is often used after be or seem to describe someone who is extremely surprised.
Surprised someone so much that they did not know what to say or think.
Practice out loudMeanings & examples
past participle used as an adjective
Extremely surprised or shocked and unable to think of what to say.
She was dumbfounded by the unexpected result.
The audience stood dumbfounded after the announcement.