/ Dictionary / Index U unused: Meaning and Definition of Find definitions for: un•used Pronunciation: (un-yzd' for 1, 2 un-yst' for 3), [key] — adj. not used; not put to use: an unused room. never having been used: an unused postage stamp. not accustomed: unused to cold winters. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unused (Thesaurus) U Nu unusual Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language