The term 'thoughtful one' can be represented by two crossword solutions: 'MUSER' (5 letters) and 'DOLL' (4 letters). A 'muser' is someone who is lost in thought, often daydreaming or pondering. It is derived from the Latin word 'musa' which means muse. A 'DOLL' is a figure of a person, usually made of cloth or plastic, that is used as a toy. It is also used to describe a beautiful woman. Both words can be used to describe someone who is thoughtful and reflective.