INSIDIOUSNESS Scrabble 14 Words With Friends 17 Scrabble letter values: I1N1S1I1D2I1O1U1S1N1E1S1S1 = 14 Definition noun subtle and cumulative harmfulness (especially of a disease). noun the quality of being designed to entrap. See all 252 words you can make from INSIDIOUSNESS → 13-letter words Words starting with I Words ending with S ← Unscramble different letters