calumnious
ca.lum.ni.ous \k*-'l*m-ne--*s\ aj : constituting or marked by calumny : SLANDEROUS - ca.lum.ni.ous.ly av
Webster's English Dictionaryca.lum.ni.ous \k*-'l*m-ne--*s\ aj : constituting or marked by calumny : SLANDEROUS - ca.lum.ni.ous.ly av