/ Dictionary / Index U unbound: Meaning and Definition of Find definitions for: un•bound Pronunciation: (un-bound'), [key] — v. pt. and pp. of —adj. not bound, as a book. free; not attached, as by a chemical bond: unbound electrons. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unbound (Thesaurus) unbosom unbounded Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language