There are various synonyms that can be used to describe something or someone that is not accepted by society. One such term is "outcast" which refers to an individual who is rejected or ostracized by their community. Another synonym is "pariah" which describes a person who is considered an outcast or who is avoided by others due to their behavior or beliefs. The term "taboo" can also be used to refer to something that is not accepted by society because it is considered socially unacceptable. Other terms include "disapproved", "marginalized", "rejected", and "unacceptable". These words convey a sense of social exclusion and disapproval, indicating that something or someone is not considered part of the mainstream.