MERCILESSNESS Scrabble 17 Words With Friends 21 Definition noun feelings of extreme heartlessness. — synonyms: cruelty, pitilessness, ruthlessness noun inhumaneness evidenced by an unwillingness to be kind or forgiving. — synonyms: unmercifulness See all 416 words you can make from MERCILESSNESS → 13-letter words Words starting with M Words ending with S ← Unscramble different letters