The Collaborative International Dictionary of English v.0.48:

Grossness \Gross"ness\, n.
   The state or quality of being gross; thickness; corpulence;
   coarseness; shamefulness.
   [1913 Webster]

         Abhor the swinish grossness that delights to wound the'
         ear of delicacy.                         --Dr. T.
                                                  Dwight.
   [1913 Webster]

WordNet (r) 3.0 (2006):

grossness
    n 1: the quality of lacking taste and refinement [syn:
         coarseness, commonness, grossness, vulgarity,
         vulgarism, raunch]