UNSUBSTANTIATED ► audio Scrabble 18 Words With Friends 23 Scrabble letter values: U1N1S1U1B3S1T1A1N1T1I1A1T1E1D2 = 18 Definition adjective unsupported by other evidence. — synonyms: uncorroborated See all 1051 words you can make from UNSUBSTANTIATED → 15-letter words Words starting with U Words ending with D ← Unscramble different letters