不识好歹 bù shí hǎo dǎi

DEFINITIONS

  1. unable to tell good from bad (idiom)
  2. undiscriminating

CHARACTERS

不 bù
HSK 1
no, not; un-; negative prefix
识 shí
HSK 1
recognize, understand, know
好 hǎo
HSK 1
good, excellent, fine; well
歹 dǎi
HSK 6
bad, vicious, depraved, wicked