English

Definition of nonplussed adjective from the Oxford Advanced Learner's Dictionary

 

nonplussed

 adjective
(also US English nonplused) adjective
BrE BrE//ˌnɒnˈplʌst//
 
; NAmE NAmE//ˌnɑːnˈplʌst//
 
 
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so surprised and confused that you do not know what to do or say synonym dumbfounded Branson seemed a little nonplussed at Ellie’s refusal. He was rather nonplussed by her question.
See the Oxford Advanced American Dictionary entry: nonplussed