RUTHLESSNESS Scrabble 15 Words With Friends 17 Definition noun mercilessness characterized by a lack of pity. — synonyms: pitilessness noun feelings of extreme heartlessness. — synonyms: cruelty, mercilessness, pitilessness See all 437 words you can make from RUTHLESSNESS → 12-letter words Words starting with R Words ending with S ← Unscramble different letters