IPA: //ʌnˈsoʊʃəl//
KK: /ʌnˈsoʊʃəl/
Not wanting to be with other people or not enjoying their company.
He is often considered unsocial because he prefers to spend time alone rather than with friends.
Unsocial → It is formed from "un-" (meaning not) and "social" (from Latin "socialis", meaning of companionship or society). The word "unsocial" means not inclined to associate with others or lacking social interaction.
Think of 'not' ('un-') being combined with 'companionship' ('social') to remember that 'unsocial' describes someone who is not inclined to socialize.