A priggish person is someone who is excessively prim and proper, often in a condescending manner. They are usually seen as being overly concerned with propriety and etiquette, and often display a sense of superiority. Priggish people are often referred to as prudes, which is a term used to describe someone who is excessively modest or proper, and they are also often snobs, which is a term used to describe someone who looks down on those who are not of the same social class.