When that happened, all the guards and inmates were dumfounded.
From the theepochtimes.com
I am dumfounded that we didn't at least try to get a deal with Scott Dann, a really talented defender.
From the expressandstar.com
To say she was dumfounded would be an understatement.
From the timesunion.com
He was bitter and dumfounded, but above all he was angry.
From the scoop.co.nz
Knowing that Rove is the epitome of right wing fanaticism, I was still dumfounded watching his display last night.
From the entertainment.time.com
Hotel pillows were always too stuffed, too full, and lifted her head too high, so she woke, groggily dumfounded to have slept at all, with a stiff neck.
From the denverpost.com
Around the same time, a pair of fossil hunters were dumfounded to find prehistoric reptile teeth and bones scattered over the same area.
From the dallasnews.com
However this time, I don't know why, I pressed my face against the window and with jazz hands, I waved bye-bye as she stood dumfounded on the pavement.
From the guardian.co.uk
The committee members were dumfounded by her extreme digression from the subject at hand, and her ploy had the opposite effect of making her indecent relationship with Jiang all the more obvious.
From the theepochtimes.com
More examples
Perplex: be a mystery or bewildering to; "This beats me!"; "Got me--I don't know the answer!"; "a vexing problem"; "This question really stuck me"