The Collaborative International Dictionary of English v.0.48:

Mawkish \Mawk"ish\, a. [Orig., maggoty. See Mawk.]
   1. Apt to cause satiety or loathing; nauseous; slightly
      nauseating; disgusting.
      [1913 Webster]

            So sweetly mawkish', and so smoothly dull. --Pope.
      [1913 Webster]

   2. Easily disgusted; squeamish; sentimentally fastidious.
      --J. H. Newman.
      [1913 Webster]

   3. Weakly sentimental; maudlin.
      [PJC]

WordNet (r) 3.0 (2006):

mawkish
    adj 1: effusively or insincerely emotional; "a bathetic novel";
           "maudlin expressions of sympathy"; "mushy effusiveness";
           "a schmaltzy song"; "sentimental soap operas"; "slushy
           poetry" [syn: bathetic, drippy, hokey, maudlin,
           mawkish, kitschy, mushy, schmaltzy, schmalzy,
           sentimental, soppy, soupy, slushy]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "mawkish":
   bad, barfy, bathetic, beery, brackish, cloying, fetid, foul,
   fulsome, gooey, gushing, high, icky, luscious, maggoty, maudlin,
   mushy, namby-pamby, nasty, nauseant, nauseating, nauseous, noisome,
   nostalgic, nostomanic, noxious, offensive, overripe,
   oversentimental, oversentimentalized, oversweet, poisonous, rancid,
   rank, rebarbative, rich, romantic, rotten, saccharine, sappy,
   sentimental, sentimentalized, sickening, sickly-sweet, sloppy,
   slushy, soft, soppy, spoiled, sticky, tears, teary, vile, vomity,
   weevily, yucky