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English definition of “nonplussed”

nonplussed

adjective     /ˌnɒnˈplʌst/ US  /ˌnɑːn-/
surprised , confused , and not certain how to react : I was completely nonplussed by his reply .SurprisedDoubt and ambivalenceHesitating
(Definition of nonplussed adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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