antisocial behaviour is violent or harmful to other people, or shows that you do not care about other people:
She was finding it hard to cope with her son's increasingly antisocial behaviour.
Smoking is an antisocial habit.
someone who is antisocial does not enjoy meeting or being with other people [≠ sociable]:
If I don't go tonight, everyone will accuse me of being antisocial.
an activity or job that is antisocial does not give you the chance to meet other people:
I got fed up with the low pay and antisocial hours.