/ Dictionary / Index M minacious: Meaning and Definition of Find definitions for: mi•na•cious Pronunciation: (mi-nā'shus), [key] — adj. menacing; threatening. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: minacious (Thesaurus) minable minah Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language