Another word for dumbfounded

I was too dumbfounded to speak.

When he described the scene to Cynthia later that night, she was dumbfounded that he hadn't burst into the boudoir and exposed the bloodied corpse of the dead acting sheriff that she was certain was reposing behind the closed door.

While I was dumbfounded, inherent pragmatism caused me to further prompt.

But when I think about it, I guess I shouldn't be exactly dumbfounded.

She looked dumbfounded but made no move to stop him.