slanderously vs calumniously

slanderously and calumniously both are adverbs.

Word	Noun	Adjective	Verb	Adverb
slanderously	No	No	No	Yes
calumniously	No	No	No	Yes

As adverbs, slanderously and calumniously are synonyms defined as:

slanderously and calumniously: in a false and slanderous and defamatory manner; with slander or calumny

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