/ Dictionary / Index U unstainable: Meaning and Definition of Find definitions for: un•stain•a•ble Pronunciation: (un-stā'nu-bul), [key] — adj. that cannot be spotted or stained, as garments. that cannot be morally reprehensible: an unstainable person. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unstable unstained 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