Antisocial (adjective)

1. Opposed to or hostile to normal standards of social behavior.
2. Not inclined to associate with others; unsociable.

Origin:

Early 19th century: from anti- + social, on the pattern of words such as antidemocratic.

Examples:

1. He was considered to be antisocial because he never talked to anyone.
2. The antisocial behavior of the youth was causing problems in the community.
3. The criminal's antisocial tendencies led to a life of crime.
4. The company's policies are seen as antisocial by its employees.
5. The individual's antisocial behavior led to his expulsion from the group.