Mrs. Grundy is a term used to describe a person who represents conventional attitudes and values. It is used to refer to someone who is easily offended by any deviation from social norms. The term is derived from a character in a play called "Speed the Plough" which was first performed in 1798. Some synonyms for the term Mrs. Grundy include conservative, traditionalist, stickler, prude, and puritan. These terms have a negative connotation and are used to describe people who are resistant to change and are unable to adapt to new ideas or ways of doing things. However, it is important to note that these attitudes are not always negative, as they may serve to maintain social order and stability.