Source : Webster's Revised Unabridged Dictionary (1913)

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.

         By their own perplexities involved, They ravel more.
                                                  --Milton.