THOUGHTLESS /ˈθɔːtləs/ ► audio Scrabble 18 Words With Friends 19 Definition adjective showing lack of careful thought. adjective without care or thought for others. — synonyms: uncaring, unthinking Examples “A thoughtless remark.”“The debate turned into thoughtless bickering.” See all 352 words you can make from THOUGHTLESS → 11-letter words Words starting with T Words ending with S ← Unscramble different letters