Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: nonplus 'state of confusion' (16-19 centuries), from Latin non plus 'no more'

nonplussed

 adjective
     
non‧plussed also nonplused American English [not before noun]
so surprised by something that you do not know what to say or do
nonplussed by/at
Billy was completely nonplussed by Elliot's refusal.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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