/ Dictionary / Index M monotonous: Meaning and Definition of Find definitions for: mo•not•o•nous Pronunciation: (mu-not'n-us), [key] — adj. lacking in variety; tediously unvarying: the monotonous flat scenery. characterizing a sound continuing on one note. having very little inflection; limited to a narrow pitch range. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: monotonous (Thesaurus) monotonic monotony Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language