The Collaborative International Dictionary
Slanderousness
Slanderous \Slan"der*ous\, a.
Given or disposed to slander; uttering slander. ``Slanderous tongue.''
--Shak.Embodying or containing slander; calumnious; as, slanderous words, speeches, or reports. [1913 Webster] -- Slan"der*ous*ly, adv. -- Slan"der*ous*ness, n.
Wiktionary
slanderousness
n. The state or condition of being slanderous.