The Collaborative International Dictionary
Calumniousness
Calumnious \Ca*lum"ni*ous\, a. [L. calumniosus.] Containing or implying calumny; false, malicious, and injurious to reputation; slanderous; as, calumnious reports.
Virtue itself 'scapes not calumnious strokes.
--Shak.
Syn: . Slanderous; defamatory; scurrilous; opprobrious; derogatory; libelous; abusive. -- Ca*lum"ni*ous*ly, adv. -- Ca*lum"ni*ous*ness, n.
Wiktionary
calumniousness
n. calumny