when someone prefers not to be with other people► distant unfriendly and showing no emotion, as if other people's lives are of no interest to you: · The neighbors seem very distant, although I try to be friendly.· As she was growing up, her father was always distant and took little interest in her achievements.
► aloof unfriendly and not wanting to talk to other people or spend time with them, especially because you think you are better than them: · Barbara remained aloof behind the barrier of her menu.· The organization is controlled by aloof intellectuals who do not take an interest in the ordinary members.
► stand-offish/standoffish behaving in an unfriendly and rather formal way, as if you do not want to get too involved with other people: · She can be quite stand-offish sometimes.· He was well-liked by the senior members of the firm, even though his colleagues found him standoffish and arrogant.
► antisocial someone who is antisocial does not enjoy being with other people and tries to avoid meeting them or talking to them: · Not everyone who likes playing computer games is an antisocial loner.· Because she was so shy, people often thought she was antisocial.
► unapproachable someone who is unapproachable seems unfriendly so that you are nervous about talking to them: · He kept his arms crossed in front of him and seemed somewhat unapproachable.· A lot of the guys thought she was attractive, but she seemed so unapproachable that no one dared to talk to her.
rather unfriendly and formal SYN aloof: 
She was cold and stand-offish.—stand-offishly adverb—stand-offishness noun [uncountable]