The Collaborative International Dictionary of English v.0.48:

Hateful \Hate"ful\ (-f[.u]l), a.
   1. Manifesting hate or hatred; malignant; malevolent.
      [Archaic or R.]
      [1913 Webster]

            And worse than death, to view with hateful eyes
            His rival's conquest.                 --Dryden.
      [1913 Webster]

   2. Exciting or deserving great dislike, aversion, or disgust;
      odious.
      [1913 Webster]

            Unhappy, wretched, hateful day!       --Shak.

   Syn: Odious; detestable; abominable; execrable; loathsome;
        abhorrent; repugnant; malevolent. -- Hate"ful*ly, adv.
        -- Hate"ful*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

hatefulness
    n 1: the quality of being hateful [syn: hatefulness,
         obnoxiousness, objectionableness]