/ Dictionary / Index U unalterable: Meaning and Definition of Find definitions for: un•al•ter•a•ble Pronunciation: (un-ôl'tur-u-bul), [key] — adj. not capable of being altered, changed, or modified. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unalterable (Thesaurus) unalienable unaltered Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language