1. to astonish or confuse someone so much that they are unable to speak or react
Usage: third-person singular present tense of 'dumbfound'; often used in passive voice

Examples

• The magician's trick dumbfounds the audience every time.
• Her sudden announcement dumbfounds everyone in the room.
• Nothing dumbfounds him—he always has a quick response.
• The complexity of the problem dumbfounds most students.
• His talent for languages dumbfounds his teachers.
• The unexpected plot twist dumbfounds viewers of the film.