不明就裡 bù míng jiù lǐ

DEFINITIONS

  1. not to understand the situation
  2. unaware of the ins and outs

CHARACTERS

不 bù
HSK 1
no, not; un-; negative prefix
明 míng
HSK 1
bright, light, brilliant; clear
就 jiù
HSK 2
just, simply; to come, go to; to approach, near
裡 lǐ inside, interior, within