Breadcrumb Home > Dictionary > Index M mutism: Meaning and Definition of Find definitions for: mut•ism Pronunciation: (my'tiz-um), [key] — n. Psychiatry. an inability to speak, due to a physical defect, conscious refusal, or psychogenic inhibition. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mutism (Thesaurus) mutiny Mutsuhito ✖ Related Content Daily Word Quiz: restive Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language