不知死活------heedless of consequences

例句：
A: He's often fooling around with those ill figures.
他经常和那些不良分子鬼混。
B: He's really heedless of conflequences. Sooner or later he will ask for trouble.
他真是不知死活，迟早他将自食其果。

注释：
fool around 鬼混
sooner or later 迟早