The term 'Prudish Sort' can be broken down into two words: 'Priss' (5 letters) and 'PRIG' (4 letters). A priss is someone who is excessively prim and proper, often to the point of being annoying. A PRIG is someone who is overly concerned with propriety and etiquette, and is often seen as a stickler for rules. Both terms are used to describe someone who is overly concerned with appearances and etiquette, and who may be seen as overly judgmental or moralistic.