unwilling or unable to associate in a normal or friendly way with other people

He's not antisocial, just shy.

antagonistic, hostile, or unfriendly toward others; menacing; threatening

an antisocial act.

opposed or detrimental to social order or the principles on which society is constituted

antisocial behavior.

Psychiatry . of or pertaining to a pattern of behavior in which social norms and the rights of others are persistently violated.

a person exhibiting antisocial traits.

adjective

friendly , fun-loving , participating , sociable

adjective

alienated , ascetic , asocial , austere , cold , cynical , eremetic , hermitlike , introverted , misanthropic , reclusive , remote , reserved , retiring , solitary , standoffish , uncommunicative , unfriendly , unsociable , withdrawnnotes:to be antisocial is to be hostile to or disruptive of the established social order , marked by or engaging in behavior that violates accepted mores; while being unsociable means one is not disposed to seek the company of others or is reserved , anarchistic , hostile , rebellious