黑白不分

hēibáibùfēn
can't tell black from white (idiom); unable to distinguish wrong from right

CEDICT

是非、善惡分不清楚。

重編國語辭典

Entry Composition

1 黑白 hēibái
  1. black and white
  2. right and wrong
  3. monochrome
2 不分 bùfēn
  1. not to distinguish; to make no distinction
  2. (LGBT slang) versatile (open to either penetrative or receptive role)