The term 'Treat Carelessly' can be summarized by the crossword solution 'NEGLECT, ' which is a 7-letter word. NEGLECT is defined as the failure to take proper care of someone or something, or the act of disregarding something. It is often used in the context of child NEGLECT, which is when a parent or guardian fails to provide adequate care for a child. NEGLECT can also refer to the lack of attention given to an object or task, such as when someone neglects to do their chores or neglects to maintain their car.