per·plex·i·ty /pɝˈplɛksəti/
  困惑,混亂,糾纏
  Per·plex·i·ty n.; pl. Perplexities   The quality or state of being perplexed or puzzled; complication; intricacy; entanglement; distraction of mind through doubt or difficulty; embarrassment; bewilderment; doubt.
  By their own perplexities involved,
  They ravel more.   --Milton.
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  perplexity
       n : trouble or confusion resulting from complexity