The Collaborative International Dictionary of English v.0.48:

Lustful \Lust"ful\, a.
   1. Full of lust; excited by lust. --Spenser. --Tillotson.
      [1913 Webster]

   2. Exciting lust; characterized by lust or sensuality. "
      Lustful orgies." --Milton.
      [1913 Webster]

   3. Strong; lusty. [Obs.] " Lustful health." --Sackville.

   Syn: sensual; fleshly; carnal; inordinate; licentious; lewd;
        unchaste; impure; libidinous; lecherous. --
        Lust"ful*ly, adv. -- Lust"ful*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

lustfulness
    n 1: a strong sexual desire [syn: lecherousness, lust,
         lustfulness]