The Collaborative International Dictionary of English v.0.48:

Sleight \Sleight\, n. [OE. sleighte, sleihte, sleithe, Icel.
   sl?g? (for sl?g?) slyness, cunning, fr. sl?gr (for sl?gr)
   sly, cunning. See Sly.]
   1. Cunning; craft; artful practice. [Obs.] "His sleight and
      his covin." --Chaucer.
      [1913 Webster]

   2. An artful trick; sly artifice; a feat so dexterous that
      the manner of performance escapes observation.
      [1913 Webster]

            The world hath many subtle sleights.  --Latimer.
      [1913 Webster]

   3. Dexterous practice; dexterity; skill. --Chaucer. "The
      juggler's sleight." --Hudibras.
      [1913 Webster]

   Sleight of hand, legerdemain; prestidigitation.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sleight
    n 1: adroitness in using the hands [syn: dexterity, manual
         dexterity, sleight]

Moby Thesaurus II by Grady Ward, 1.0:

84 Moby Thesaurus words for "sleight":
   adroitness, art, artful dodge, artifice, bag of tricks, blind,
   bluff, bosey, catch, chicane, chicanery, chouse, collusion,
   connivance, connivery, conspiracy, contrivance, coup, covin, craft,
   curve, curve-ball, cute trick, deceit, deftness, design, device,
   dexterity, dexterousness, dirty deal, dirty trick, dodge, dodgery,
   expedient, fakement, fast deal, feint, fetch, ficelle, foul play,
   gambit, game, gimmick, googly, grift, hocus-pocus, intrigue, joker,
   juggle, jugglery, knavery, little game, machination, maneuver,
   move, pass, pettifoggery, pettifogging, play, plot, ploy, prowess,
   racket, readiness, red herring, ruse, scheme, scurvy trick,
   sharp practice, shift, skill, skulduggery, sleight of hand,
   sleight-of-hand trick, stratagem, strategy, subterfuge,
   supercherie, tactic, trick, trickery, underhand dealing, wile,
   wily device