hikikomori
/hɪˌkɪkəʊˈmɔːrɪ/noun
(复同单)［mass noun］
1- (in Japan) the abnormal avoidance of social contact, typically by adolescent males（日本青少年的）茧居, 家里蹲。
1.1
- count noun a person who avoids social contact（不喜欢社交的茧居族）隐蔽青年。
词源
Japanese, literally 'staying indoors, (social) withdrawal'.