不為人知

不 buˋ buˊ fouˇ fou ˉ

No, Not, Non, None, Not able to, Un, Without, Infix Used To Indicate Inability

為人 weiˊ renˊ

(Acting, For the sake) For the sake of others, Acting in the interests of others, Acting on someone else's behalf

知 zhi ˉ

Know, Perceive, Realize, Comprehend, Be Aware