unsociable

Concise Oxford English Dictionary © 2008 Oxford University Press:
unsociable/ʌnˈsəʊʃəbl/

▶adjective not enjoying the company of others.

■ not conducive to friendly social relations.

– derivatives
unsociability noun,
unsociableness noun,
unsociably adverb.

usage: Although there is some overlap in the use of unsociable, unsocial, and antisocial, they have distinct core meanings. Unsociable means ‘not enjoying the company of others’ (Terry was grumpy and unsociable), while antisocial means ‘contrary to the customs of society’ (aggressive and antisocial behaviour). Unsocial, on the other hand, is usually used to describe hours ‘falling outside the normal working day’.