un·so·cial 
/ˌʌnˈsoʊʃəl/ adjective
/ˌʌnˈsoʊʃəl/ adjective [more unsocial; most unsocial] Brit : occurring at times that prevent you from being with your friends and family
▪ a job with unsocial hours [=a job that requires you to work at unusual hours when other people are spending time together]
▪ a job with unsocial hours [=a job that requires you to work at unusual hours when other people are spending time together]
