The term 'COMMON QUALITY' can be broken down into two crossword solutions: SENSE (5 letters) and DECENCY (7 letters). SENSE is the ability to perceive, understand, and judge things correctly. It is a quality that is shared by all humans and is essential for making sound decisions. DECENCY is a quality of being polite, respectful, and considerate. It is a quality that is expected of people in society and is necessary for maintaining good relationships with others.