不為人知 bù wéi rén zhī

DEFINITIONS

  1. not known to anyone
  2. secret
  3. unknown

CHARACTERS

不 bù
HSK 1
no, not; un-; negative prefix
為 wéi do, handle, govern, act; be
人 rén
HSK 1
man; people; mankind; someone else
知 zhī
HSK 2
know, perceive, comprehend