STRENUOUSNESS Scrabble 13 Words With Friends 17 Scrabble letter values: S1T1R1E1N1U1O1U1S1N1E1S1S1 = 13 Definition noun extreme effortfulness. — synonyms: arduousness See all 457 words you can make from STRENUOUSNESS → 13-letter words Words starting with S Words ending with S ← Unscramble different letters