present participle
Surprising someone so much that they do not know what to say or think.
The results are dumbfounding everyone on the research team.
She is dumbfounding the judges with her answers.
American English
How to pronounce dumbfounding
verb · adjectiveB2
DUHMfowndihng
/ˈdəm.faʊn.dɪŋ/
3 syllables · Stress the first syllable.
Form of dumbfound
Surprising someone so much that they do not know what to say or think.
Practice out loudMeanings & examples
adjective
Causing such great surprise that people do not know what to say or think.
The museum made a dumbfounding discovery.
His dumbfounding explanation left the audience silent.