Flummoxed

The atheist completely flummoxed her opponent in the debate by asking, "And who created God?"

I was rather flummoxed when I saw that the date on the plane ticket I had been given was from last year.

He was too flummoxed to reply.

He's good at what he knows, but he gets completely flummoxed when new problems arise.

‘Itʼs amazing, these bosses call all the shots but are flummoxed by the smallest technological advances.’

“What would you have done?” he demanded more than once of Ms. Le Pen, without ever getting a direct response. She did not seem to have one and looked flummoxed.