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It seems there is an informal use where it is a synonym for unperturbed.
This is what it means everyone else is wrong
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I always thought it was a weird word, and I assumed it was the opposite of plussed, whatever that is. I thought plussed must have meant clear and understandable. Boy was I wrong.
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"The word nonplussed comes from the Latin phrase nōn plūs, which means "not more". The word was first used in English in the 16th century."
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This was my sense
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