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nonplussed (adj.)

"perplexed, puzzled, confounded," c. 1600, past-participle adjective from nonplus, which is from Latin non plus "no more, no further." 

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Definitions of nonplussed from WordNet

nonplussed (adj.)
filled with bewilderment;
Synonyms: at a loss / nonplused / puzzled
From wordnet.princeton.edu