If "social" means relating to society or the interaction of people:
* Unsociable: This is the most direct antonym, meaning someone who dislikes or avoids social interaction.
* Antisocial: This implies a deliberate avoidance of society and a potential for harm.
* Isolated: This describes a state of being alone and cut off from society.
* Hermit-like: This describes someone who lives in solitude.
* Reclusive: This refers to someone who lives a solitary life and avoids social interaction.
If "social" means relating to a specific social group:
* Individualistic: This refers to someone who focuses on their own needs and goals rather than those of a group.
* Unconventional: This describes someone who does not follow the norms or expectations of a particular social group.
* Independent: This refers to someone who does not rely on others or social structures.
If "social" means related to society in a broad sense:
* Asocial: This refers to a lack of social awareness or sensitivity.
* Nonconformist: This describes someone who does not follow societal norms or expectations.
* Rebellious: This refers to someone who actively challenges societal norms and authority.
The best antonym will depend on the specific context of your usage.