Source : Webster's Revised Unabridged Dictionary (1913)

Hateful \Hate"ful\, a.
   1. Manifesting hate or hatred; malignant; malevolent.
      [Archaic or R.]

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

   2. Exciting or deserving great dislike, aversion, or disgust;
      odious.

            Unhappy, wretched, hateful day!       --Shak.

   Syn: Odious; detestable; abominable; execrable; loathsome;
        abhorrent; repugnant; malevolent. -- {Hate"ful*ly}, adv.
        -- {Hate"ful*ness}, n.

Source : WordNet®

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