To stupefy means to shock or surprise someone so much that they can't think clearly.
Stupefy can make people think of magic or surprise. It is usually a very strong feeling.
Examples:
The magician used a spell to stupefy the audience.
The loud noise stupefied the little child.
The bright lights stupefied the animals in the forest.
The big surprise stupefied the cat!
The amazing magic trick stupefied everyone in the room.
The stupefying news made everyone stop and stare.