totally confuse somebody
flummox - confuse
The informal word ‘flummox’ is used to express being so baffled by something that in the moment you do not know what to say or how to react. It is generally not used in relation to something too serious, and can be used in both a social and professional context.
When it comes to computers, it doesn’t take much to flummox me. I’m a bit of a technological troglodyte!
I found myself a little flummoxed by Jane’s suggestion. It just came totally out of left field.
My exam was going really well but then the last question totally flummoxed me. I ended up making an incoherent stab at it.