- 鳏寡孤独 guānguǎgūdú the lonely and helplessWidowers, widows, orphans, and the childless; refers broadly to people with no one left to rely on who cannot support themselves.
- 矜寡孤独 guānguǎgūdú the helplesswidowers, widows, orphans, and the childless; those who have no kith or kin and cannot support themselves
- 孤独于世 gūdúyúshì alone in the world(idiom) to be all alone in the world
- 孤独症 gūdúzhèng autismA developmental disorder characterized by difficulties in social interaction and communication; also called [[自闭症|自閉症|zi4 bi4 zheng4]]
