dumbfounded

American  

[duhm-foun-did, duhm-foun-] / dʌmˈfaʊn dɪd, ˈdʌmˌfaʊn- /

Or dumfounded

adjective

1. speechless with amazement; astonished or showing astonishment.

   I smiled at the dumbfounded look on their faces as their eyes widened and their mouths fell slack.

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verb

1. the simple past tense and past participle of dumbfound.

Etymology

Origin of dumbfounded

dumbfound ( def. ) + -ed ² ( def. )

Example Sentences

“Whether owing to that striking optimism or some other loftier force at work,” said family member Gregory Small, she had survived with pancreatic cancer for 12 years, a feat that left her doctors dumbfounded.

From Los Angeles Times

I stand there, dumbfounded for a moment, before Autumn nudges me.

From Literature

He might have been a bit dumbfounded but Bass never hesitated in accepting the challenge.

From Literature

The South Park police force is dumbfounded by the videos, believing they are real.

From Los Angeles Times

“I’m kind of just dumbfounded why it’s going up so much,” said Chad Smith, 51, who with his wife owns a landscaping company in Coeur d’Alene.

From The Wall Street Journal