Calumnious in a sentence as an adjective

Org/doc/html/rfc1122#page-8 [OSI] The theory that OSI stands for "over specified interface" is calumnious lies.

Calumnious definitions

adjective

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

See also: calumniatory defamatory denigrative denigrating denigratory libellous libelous slanderous