The phrase "dumbfounded about" is correct and can be used in written English.
It means to be completely shocked or surprised by something. Example: "Samantha was dumbfounded about the news of her promotion. She never expected to be chosen for the position."
"I was dumbfounded" about the chance meeting, Mr. Klein said.
Our student bloggers are a bit "baffled" and "dumbfounded" about the admission decisions, too.
At one point, she used the word "dumbfounded," though it's not clear what she was dumbfounded about.
"We're just dumbfounded about why they have worked so hard to cut us out of all the activities of the school," said Grace Davidson, class of 1942, a former association president.
I was in the pub on Saturday talking to some non-gamer friends about the controversy, I explained the Xbox One restrictions to them and they were completely dumbfounded about why anyone would buy it.
He says he is "dumbfounded" about his friend.
But before he makes his out-there declaration, the Bourne Identity star tells a roomful of seemingly dumbfounded journalists about World Toilet Day, the November event that raises awareness for the more than 2.5 billion people who don't have access to toilets.
Marjorie Anders, a spokeswoman for Metro North, was dumbfounded to hear about those who see the station as a 47-acre infiltration challenge.
Dumbfounded, he goes about his business of doing whatever it was that used to make you happy, while you just go to work.
"I am dumbfounded like everyone else" about Enron's collapse, he said.
"I was horrified and dumbfounded when I heard about the [Division of Oil, Gas and Mining's] contest," Cherise Udell, the group's founder, told The Huffington Post over the phone on Thursday.
