at a loss for words

“I’m kind of at a loss for words.”

The driver paused, apparently at a loss for words, and meekly apologized.

Ed Sheeran, who co-wrote Payne's 2017 debut solo single Strip That Down, also reacted to the news on Instagram on Friday, saying he was "at a loss for words".

Mookie Betts is at a loss for words as he begins another postseason mired in a slump that threatens to derail the Dodgers’ World Series aspirations.

I was speechless, just completely at a loss for words at how the Hurley story wrapped up.