(n.) The condition or quality of being evil; badness; viciousness; malignity; vileness; as, evilness of heart; the evilness of sin.

arrantness badness baseness damnability devilishness devilry deviltry fiendishness flagitiousness foulness heinousness hellishness improperness inaccuracy inauspiciousness inexpedience inferiority iniquitousness invalidity malevolence moral badness naughtiness nefariousness peccancy rankness reprehensibility sinfulness unfavorableness unhealthiness unkindness unpleasantness unskillfulness viciousness vileness villainousness wickedness