precarious

He earned a precarious livelihood/living by gambling.他靠赌博谋生，过着朝不保夕的生活。

She was in a state of precarious [=delicate] health.她的健康状况不稳定。

The government is in a precarious position. [=a dangerous position that must be dealt with carefully]政府处于一种不稳定的状态。

The strong wind almost knocked him off of his precarious perch on the edge of the cliff.他在悬崖边站得不稳，大风差点把他饮下悬崖。