"Prudishness is a noun that means a tendency to be overly concerned about morals and seemly behavior, especially regarding sexual matters. It can also mean being very easily shocked by rude things, particularly those related to sex.

Here are some synonyms for prudishness:
Grundyism, Primness, Modesty, Moralism, Nice-nellyism, and Puritanism.

Being called prudish is not a compliment. It means being proper to an exaggerated or ridiculous degree.

For example, some say that the prudishness of people in the Victorian era hindered the spread of basic information about human health and hygiene"