Cliquishness is a term that refers to an exclusive or closed group. However, there are several synonyms that can be used to describe this phenomenon, including exclusivity, insularity, and elitism. Exclusivity implies a closed group that is selective in their membership, often based on shared characteristics or interests. Insularity is another synonym, which connotes a narrow-mindedness and lack of interest in engaging with others outside the group. Elitism is a term that suggests the group believes themselves to be superior to others, based on their status, wealth, or other factors. Ultimately, these synonyms all refer to the same type of behavior: the tendency for groups to be exclusive and closed off from the larger community.