precariously
adverb uk/prɪˈkeə.ri.əs.li/ us/prɪˈker.i.əs.li/
危险地；不牢靠地；不稳地
in a way that is likely to fall, be damaged, fail, etc.
Her suitcase was precariously balanced on the tiny luggage rack above her head. 她的手提箱放在头顶的小行李架上，摇摇晃晃的，很不安全。
He lived somewhat precariously from one day to the next, never knowing where his next meal was coming from. 他日子过得很不稳定，吃了上顿难保下顿的。