不得而知 bù dé ér zhī

DEFINITIONS

  1. unknown
  2. unable to find out

CHARACTERS

不 bù
HSK 1
no, not; un-; negative prefix
得 dé
HSK 2
obtain, get, gain, acquire
而 ér
HSK 3
and; and then; and yet; but
知 zhī
HSK 2
know, perceive, comprehend