Source : Webster's Revised Unabridged Dictionary (1913)

Puzzlement \Puz"zle*ment\, n.
   The state of being puzzled; perplexity. --Miss Mitford.

Source : WordNet®

puzzlement
     n : confusion resulting from failure to understand [syn: {bewilderment},
          {obfuscation}, {befuddlement}, {mystification}, {bafflement},
          {bemusement}]