The crossword solution for the term 'restrained, with 'IN'' is REINED, a 6-letter word. The term 'reined' is used to describe a situation IN which someone or something is held back or controlled. It is often used IN the context of horses, as reins are used to control the horse's movements. IN a more general sense, it can be used to describe any situation IN which someone or something is kept IN check or limited.