Prudishness is a term used to describe a person who is excessively modest or prim in their behavior. PRIMNESS is an 8-letter word that is closely related to prudishness, and is defined as being very proper and formal in one's manner or behavior. PRUDERY is a 7-letter word that is also related to prudishness, and is defined as being excessively concerned with propriety and decorum. All three terms are often used to describe someone who is overly concerned with morality and modesty.