Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

calumniously
     adv : in a false and slanderous and defamatory manner; with
           slander or calumny [syn: {slanderously}]