不識好歹 [－识－－]

Jyutping bat1 sik1 hou2 daai2
Pinyin bù shí hǎo dǎi

Definitions (CC-CEDICT)
  1. unable to tell good from bad (idiom)
  2. undiscriminating
Definitions (粵典–words.hk)
  1. 語句
    分辨​唔​到​好​同壞​。​指人糊塗​、​唔​知道​事情​嘅​是非​或​輕重
    not to know chalk from cheese; be gullible; Literally cannot tell good from bad
Definitions (Wiktionary)
  1. adj
    Synonym of 不知好歹 (bùzhīhǎodǎi).
    (syn.) 不知好歹