未知数 Traditional 未知數 wèi zhī shù 🔊 unknown number HSK 7–9 + Keep this word Meanings wèi zhī shù 未知數 unknown number(fig.) an unknown; an uncertainty Its characters 未wèinot yetHSK 6知zhīto know数shǔto countHSK 4 Words with 未知数 未知数儿 wèi zhī shù r erhua variant of 未知數|未知数[wei4 zhi1 shu4]