1. present participle of nonplus; causing someone to be confused and uncertain about how to respond
Usage: present participle form

Examples

• The teacher’s nonplusing question left the entire class silent.
• His nonplusing behavior made it difficult to predict his next move.
• The nonplusing instructions confused even the experienced workers.
• She found his nonplusing response completely unexpected.
• The nonplusing riddle stumped everyone at the party.
• His nonplusing logic made the argument hard to follow.