1. to cause to be at a loss as to what to say, think, or do; to perplex completely
Usage: third person singular present tense of ‘nonplus’

Examples

• The complex math problem nonpluses even the brightest students.
• Her unexpected question nonpluses the speaker during the interview.
• The strange behavior of the machine nonpluses the technician.
• His calm reaction to the crisis nonpluses everyone in the room.
• The riddle nonpluses all who attempt to solve it.
• The professor’s explanation nonpluses rather than helps the class.