/ Dictionary / Index C calumnious: Meaning and Definition of Find definitions for: ca•lum•ni•ous Pronunciation: (ku-lum'nē-us), [key] — adj. of, involving, or using calumny; slanderous; defamatory. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: calumnious (Thesaurus) calumniate calumny Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language