WordNet (r) 3.0 (2006):

skulduggery
    n 1: verbal misrepresentation intended to take advantage of you
         in some way [syn: trickery, hocus-pocus, slickness,
         hanky panky, jiggery-pokery, skulduggery,
         skullduggery]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "skulduggery":
   artifice, chicane, chicanery, collusion, connivance, connivery,
   conspiracy, covin, dodgery, foul play, machination, pettifoggery,
   pettifogging, sharp practice, sleight, supercherie, trickery,
   underhand dealing