nonplussed

nonplussed
adjective
  1. (of a person) surprised and confused so much that they are unsure how to react
    (人)迷惑的;吃惊的
    Henry looked completely nonplussed.
    亨利看上去完全被迷惑住了。
  2. (N. Amer. informal)(of a person) not disconcerted; unperturbed
    (北美,非正式)(人)毫不惊慌的,泰然自若的
用法
  1. In standard use nonplussed means ‘surprised and confused’, as in she was nonplussed at his eagerness to help outIn North American English a new use has developed in recent years, meaning ‘unperturbed’—more or less the opposite of its traditional meaning—as in he was clearly trying to appear nonplussedThis new use probably arose on the assumption that non- was the normal negative prefix and must therefore have a negative meaning. Although the use is common it is not yet considered standard
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