The Oxford Thesaurus An A-Z Dictionary of Synonyms - intricate adj.

1) involved, complicated, convoluted, entangled, tangled, knotty, complex, twisted, winding, tortuous, sinuous, anfractuous, labyrinthine, elaborate, Byzantine, fancy, ornate, rococo, Daedalian or Daedalean or Daedalic, Literary daedal or dedal: The plot was far too intricate and I became confused. 2) perplexing, puzzling, mystifying, enigmatic: The code was so intricate that even the computer needed hours to decipher the message.