Source : Webster's Revised Unabridged Dictionary (1913)

Malignity \Ma*lig"ni*ty\, n. [F. malignit['e], L. malignitas.]
   1. The state or quality of being malignant; disposition to do
      evil; virulent enmity; malignancy; malice; spite.

   2. Virulence; deadly quality.

            His physicians discerned an invincible malignity in
            his disease.                          --Hayward.

   3. Extreme evilness of nature or influence; perniciousness;
      heinousness; as, the malignity of fraud. [R.]

   Syn: See {Malice}.

Source : WordNet®

malignity
     n 1: wishing evil to others [syn: {malevolence}] [ant: {benevolence}]
     2: quality of being disposed to evil; intense ill will [syn: {malignancy},
         {malignance}] [ant: {benignity}, {benignity}]