1. to shock or surprise someone so much that they cannot speak or react
Usage: third person singular present tense of ‘dumfound’

Examples

• The magician’s trick dumfounds the entire audience.
• Her sudden resignation dumfounds her colleagues.
• The complexity of the math problem dumfounds even the brightest students.
• His rude behavior always dumfounds his friends.
• The news of the lottery win dumfounds the family.
• The professor’s explanation dumfounds the confused students even more.