Longman Dictionary of Contemporary English - anti-social

~ adj 1 unwilling to meet people and talk to them, especially in a way that seems unfriendly or rude  (a child who was aggressive and anti-social) 2 an activity that is anti-social does not give you the chance to meet other people  (The job's OK, but I have to work very anti-social hours.) 3 anti-social behaviour shows a lack of concern for other people  (Smoking cigarettes in public is increasingly considered anti-social.)