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 nonplusses even the brightest students.
• Her unexpected question nonplusses the speaker during the interview.
• The magician’s trick nonplusses the entire audience.
• The contradictory evidence nonplusses the detective.
• His calm reaction to the crisis nonplusses his worried colleagues.
• The foreign customs nonplus the tourists visiting for the first time.