1. causing someone to be confused and unsure how to react
Usage: present participle of nonplus

Examples

• The teacher’s unexpected question was nonplussing to the entire class.
• His sudden change in behavior is nonplussing his friends.
• The complex instructions were nonplussing even the experienced workers.
• She found the maze of hallways nonplussing on her first day.
• The contradictory evidence is nonplussing the investigators.
• His calm reaction to the crisis was nonplussing to everyone present.