When someone is behaving anti-socially, it means they are not conforming to the norms of society. Synonyms for this word could include unsociably, unfriendly, reclusive, isolated, withdrawn, introverted, solitary, or uncommunicative. These words describe someone who is not interested in interacting with others or participating in social activities. Other synonyms could include reserved, standoffish, or aloof, which could suggest a sense of superiority or a lack of interest in socializing with others. Regardless of the word used, it is important to remember that everyone has their own preferences for how they spend their time, and it is not always necessary or desirable to conform to the expectations of others.