1. confused and uncertain about how to respond or what to do
Usage: formal

Examples

• She was completely nonplussed by his unexpected question.
• The teacher looked nonplussed when the student gave such an unusual answer.
• I was nonplussed by the complicated instructions and didn’t know where to start.
• His strange behavior left everyone nonplussed.
• The sudden change in plans left us all feeling nonplussed.
• She stood there nonplussed, unable to think of what to say next.