The Collaborative International Dictionary of English v.0.48:

Fulsome \Ful"some\, a. [Full, a. + -some.]
   1. Full; abundant; plenteous; not shriveled. [Obs.]
      [1913 Webster]

            His lean, pale, hoar, and withered corpse grew
            fulsome, fair, and fresh.             --Golding.
      [1913 Webster]

   2. Offending or disgusting by overfullness, excess, or
      grossness; cloying; gross; nauseous; esp., offensive from
      excess of praise; as, fulsome flattery.
      [1913 Webster]

            And lest the fulsome artifice should fail
            Themselves will hide its coarseness with a veil.
                                                  --Cowper.
      [1913 Webster]

   3. Lustful; wanton; obscene; also, tending to obscenity.
      [Obs.] "Fulsome ewes." --Shak. -- Ful"some*ly, adv. --
      Ful"some*ness, n. --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fulsomeness
    n 1: excessive but superficial compliments given with affected
         charm [syn: unction, smarm, fulsomeness]
    2: smug self-serving earnestness [syn: fulsomeness,
       oiliness, oleaginousness, smarminess, unctuousness,
       unction]