Source : Webster's Revised Unabridged Dictionary (1913)

Barbarity \Bar*bar"i*ty\, n.; pl. {Barbarities}. [From
   {Barbarous}.]
   The state or manner of a barbarian; lack of civilization.

   2. Cruelty; ferociousness; inhumanity.

            Treating Christians with a barbarity which would
            have shocked the very Moslem.         --Macaulay.

   3. A barbarous or cruel act.

   4. Barbarism; impurity of speech. [Obs.] --Swift.

Source : WordNet®

barbarity
     n 1: the quality of being shockingly cruel and inhumane [syn: {atrocity},
           {atrociousness}, {barbarousness}, {heinousness}]
     2: a brutal barbarous savage act [syn: {brutality}, {barbarism},
         {savagery}]