From King Dictionary of Contemporary Englishunsociableun‧so‧cia‧ble /ʌnˈsəʊʃəbəl $ -ˈsoʊ-/ adjective FRIENDLY#not wanting to be with people or to go to social events SYN anti-social unsocial
Examples from the Corpus
unsociableThe hours can be long and sometimes unsociable, and the responsibilities testing.Thomas Fuller Bacon was born in Stamford in 1824 and was considered to be stubborn, selfish and unsociable as a child.Being unsociable can be very catching.Southall was grumpy and unsociable, not like him.At full whack, I would guess that the Rivera exhibits some very unsociable tendencies indeed.