不知死活 bù zhī sǐ huó

DEFINITIONS

  1. to act recklessly (idiom)

CHARACTERS

不 bù
HSK 1
no, not; un-; negative prefix
知 zhī
HSK 2
know, perceive, comprehend
死 sǐ
HSK 4
die; dead; death
活 huó
HSK 4
live, exist, survive; lively