The Collaborative International Dictionary of English v.0.48:

Odious \O"di*ous\, a. [L. odiosus, from odium hatred: cf. F.
   odieux. See Odium.]
   1. Hateful; deserving or receiving hatred; as, an odious
      name, system, vice. "All wickedness will be most odious."
      --Sprat.
      [1913 Webster]

            He rendered himself odious to the Parliament.
                                                  --Clarendon.
      [1913 Webster]

   2. Causing or provoking hatred, repugnance, or disgust;
      offensive; disagreeable; repulsive; as, an odious sight;
      an odious smell. --Milton.
      [1913 Webster]

            The odious side of that polity.       --Macaulay.
      [1913 Webster]

   Syn: Hateful; detestable; abominable; disgusting; loathsome;
        invidious; repulsive; forbidding; unpopular.
        [1913 Webster] -- O"di*ous`ly. adv. --
        O"di*ous*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

odiousness
    n 1: the quality of being offensive [syn: offensiveness,
         odiousness, distastefulness]