non·plus /ˌnɑnˈplʌs/
  (vt.)使困惑迷惑,困惑,盡頭
  Non·plus v. t. [imp. & p. p. Nonplused or Nonplussed; p. pr. & vb. n. Nonplusing or Nonplussing.] To puzzle; to confound; to perplex; to cause to stop by embarrassment.
     He has been nonplused by Mr. Dry's desiring him to tell what it was that he endeavored to prove.   --Spectator.
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  Non·plus n.  A state or condition which baffles reason or confounds judgment; insuperable difficulty; inability to proceed or decide; puzzle; quandary.
     Both of them are a perfect nonplus and baffle to all human understanding.   --South.
  nonplus
       v : be a mystery or bewildering to; "This beats me!"; "Got me--I
           don't know the answer!"; "a vexing problem"; "This
           question really stuck me" [syn: perplex, vex, stick,
            get, puzzle, mystify, baffle, beat, pose, bewilder,
            flummox, stupefy, gravel, amaze, dumbfound]
       [also: nonplussing, nonplusses, nonplussed]