1. confused and uncertain about how to respond or what to do
Usage: also spelled ‘nonplussed’

Examples

• She was completely nonplused by his unexpected question.
• The teacher looked nonplused when no one could answer the simple math problem.
• I was nonplused by the sudden change in plans.
• His strange behavior left everyone nonplused.
• The audience sat nonplused after the confusing presentation.
• When asked about her future plans, she appeared nonplused.