Source : Webster's Revised Unabridged Dictionary (1913)

Evilness \E"vil*ness\, n.
   The condition or quality of being evil; badness; viciousness;
   malignity; vileness; as, evilness of heart; the evilness of
   sin.

Source : WordNet®

evilness
     n : the quality of being morally wrong in principle or practice;
         "attempts to explain the origin of evil in the world"
         [syn: {evil}] [ant: {good}, {good}]