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The Collaborative International Dictionary
Slanderousness

Slanderous \Slan"der*ous\, a.

  1. Given or disposed to slander; uttering slander. ``Slanderous tongue.''
    --Shak.

  2. 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.