不得而知

bù dé ér zhī

HSK level: HSK 7–9

Meaning

unknown; unable to find out

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Characters

不bùno, not, un-; negative prefix一得déto obtain, to get, to acquire; suitable, proper; ready彳旦寸而érand, and then, and yet; but 知zhīto know, to perceive, to comprehend矢口