不知所以 bù zhī suǒ yǐ 🔊 to not know the reason + Keep this word Meanings bù zhī suǒ yǐ (idiom) to not know the reason(idiom) to not know what to do Its characters 不bùnot; noHSK 1知zhīto know所suǒactuallyHSK 5以yǐto useHSK 5