/ Dictionary / Index I incommutable: Meaning and Definition of Find definitions for: in•com•mut•a•ble Pronunciation: (in"ku-my'tu-bul), [key] — adj. not exchangeable. unchangeable; unalterable. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: incommutable (Thesaurus) incommunicative incompact Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language