/ Dictionary / Index M mutable: Meaning and Definition of Find definitions for: mu•ta•ble Pronunciation: (my'tu-bul), [key] — adj. liable or subject to change or alteration. given to changing; constantly changing; fickle or inconstant: the mutable ways of fortune. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mutable (Thesaurus) mut mutable sign 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