noun
a state of perplexity or confusion
verb
to cause to be at a loss as to what to say, think, or do
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The complex mathematical problem left the students in a state of nonplus.
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I was completely nonplussed by his sudden outburst.
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I was totally nonplussed when she told me she was quitting her job.
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The unexpected turn of events left me in a state of nonplus.