Mrs Grundys is a term used to describe a narrow-minded and overly conventional person who is easily shocked by anything unconventional. There are several synonyms one can use for this term, including prude, puritan, moralist, traditionalist, conservative, and stickler for propriety. These are all words that describe people who have a strict adherence to rules and norms, particularly around social behavior, dress, and language. They often disapprove of anything that deviates from their idea of what is respectable or acceptable. While there is value in having some social norms and standards for behavior, it is important not to be overly rigid or judgmental.