病了无人照顾死了无人埋葬

'病了无人照顾死了无人埋葬' (Sick without care, dead without burial) expresses an extreme feeling of loneliness. It indicates that there is nobody to care about them, not even in the dire situations such as when they are sick or after their death. Thus, the underlying sadness of being unimportant to others can be inferred from this ID.