CALUMNIOUSLY

slanderously, calumniously

(adverb) in a false and slanderous and defamatory manner; with slander or calumny

Source: WordNet® 3.1

Etymology

Adverb

calumniously (comparative more calumniously, superlative most calumniously)

In the manner of a falsification intended to discredit another.

Source: Wiktionary

CALUMNIOUS

Ca*lum"ni*ous, a. Etym: [L. calumniosus.]

Definition: 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.

Syn: -- Ca*lum"ni*ous*ly, adv.

– Ca*lum"ni*ous*ness, n.

Source: Webster’s Unabridged Dictionary 1913 Edition