antisocial

Short definition from Wiktionary

Adjective

1. 1
   Unwilling or unable to cooperate and associate normally with other people.
2. 2
   Antagonistic, hostile, or unfriendly toward others; menacing.
3. 3
   Opposed to social order or the principles of society; hostile toward society.

Noun

1. 1
   An antisocial individual.