noun · A person who is socially isolated and has no family or friends to rely on.

他只身一人在异国他乡奋斗，有时觉得自己就像个孤魂野鬼。

noun · Spirits of the deceased who have no living descendants to offer prayers or sacrifices, doomed to roam.

传说中，农历七月会有许多孤魂野鬼来到人间寻找食物。