The Oxford Thesaurus An A-Z Dictionary of Synonyms - perplexityn.

1) confusion, bewilderment, bafflement, distress, doubt, difficulty: My perplexity grew as he related his version of the event. 2) intricacy, complexity, complicatedness, arcaneness, reconditeness, impenetrability, impenetrableness, involvement, unfathomability, obscurity, difficulty: The more deeply the enigma was probed, the greater its perplexity. 3) puzzle, enigma, mystery, dilemma, problem, paradox, catch-22, quandary, predicament, bind: Because of the interlocking directorships of the companies, we faced many perplexities in trying to sort out what had happened to the funds.