The Collaborative International Dictionary of English v.0.48:

malodorous \mal*o"dor*ous\, a.
   Offensive to the sense of smell; ill-smelling. --
   mal*o"dor*ous*ness. n. --Carlyle.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

malodorousness \mal*o"dor*ous*ness\ n.
   The attribute of having a strong offensive smell.

   Syn: stinkiness, foulness, rankness.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

malodorousness
    n 1: the attribute of having a strong offensive smell [syn:
         malodorousness, stinkiness, foulness, rankness,
         fetidness]