WordNet (r) 3.0 (2006):

mushiness
    n 1: a mushy pulpy softness [syn: mushiness, pulpiness]
    2: falsely emotional in a maudlin way [syn: mawkishness,
       sentimentality, drippiness, mushiness, soupiness,
       sloppiness]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "mushiness":
   bathos, bleeding heart, cloyingness, doughiness, flabbiness,
   fleshiness, goo, hearts-and-flowers, mashiness, maudlinness,
   mawkishness, mush, namby-pamby, namby-pambyism, namby-pambyness,
   nostalgia, nostomania, oversentimentalism, oversentimentality,
   pastiness, pithiness, pulpiness, pulpousness, romanticism,
   sentiment, sentimentalism, sentimentality, slop, sloppiness, slush,
   soap opera, sob story, softness, sponginess, squashiness,
   succulence, sweetness and light, tearjerker