/ Dictionary / Index U unbacked: Meaning and Definition of Find definitions for: un•backed Pronunciation: (un-bakt'), [key] — adj. without backing or support. not supported by bets: an unbacked challenger. not endorsed: an unbacked product. never having been mounted by a rider, as a horse. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: unbacked (Thesaurus) unawares unbalance 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