The Collaborative International Dictionary of English v.0.48:

Perplexity \Per*plex"i*ty\, n.; pl. Perplexities. [L.
   perplexitas: cf. F. perplexit['e].]
   The quality or state of being perplexed or puzzled;
   complication; intricacy; entanglement; distraction of mind
   through doubt or difficulty; embarrassment; bewilderment;
   doubt.
   [1913 Webster]

         By their own perplexities involved,
         They ravel more.                         --Milton.
   [1913 Webster]