boggle

The dogs went on, but the horse boggled at the sudden appearance of the strange beast.

He boggled at the surprising news.

The vastness of space really boggles the mind.

I would be loth to exchange consciences with them, and boggle so with God Almighty; but these men by a new kind of Metaphysick have found out a way to abstract the Person of the King from his Office to make his Soveraigntie a kinde of Platonick Idea hovering in the aire, while they visibly attempt to assail and destroy his person […]