calumnious vs libellous

calumnious and libellous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
calumnious	No	Yes	No	No
libellous	No	Yes	No	No

As adjectives, calumnious and libellous are synonyms defined as:

calumnious and libellous: (used of statements) harmful and often untrue; tending to discredit or malign

Other synonyms of calumnious include calumniatory, defamatory, denigrating, denigrative, denigratory, libelous, slanderous.

calumnious (adjective)	libellous (adjective)
(used of statements) harmful and often untrue; tending to discredit or malign	(used of statements) harmful and often untrue; tending to discredit or malign