不知所云 bù zhī suǒ yún 🔊 to not know what sb is driving at + Keep this word Meanings bù zhī suǒ yún to not know what sb is driving atto be unintelligible Its characters 不bùnot; noHSK 1知zhīto know所suǒactuallyHSK 5云yúncloudHSK 4