The crossword solutions for the term USEFUL QUALITY are 'PLUS' and 'ASSET'. The term 'PLUS' is often used to describe something that is an advantage or a benefit. It can also be used to refer to an additional feature or quality that makes something more desirable. The term 'ASSET' is used to describe something that is valuable or beneficial, and it can also refer to a person's skills or abilities. Together, these two terms can be used to describe a useful quality that someone or something possesses.