The Collaborative International Dictionary of English v.0.48:
Evilness \E"vil*ness\, n. The condition or quality of being evil; badness; viciousness; malignity; vileness; as, evilness of heart; the evilness of sin. [1913 Webster]WordNet (r) 3.0 (2006):
evilness n 1: the quality of being morally wrong in principle or practice; "attempts to explain the origin of evil in the world" [syn: evil, evilness] [ant: good, goodness]