未知数 Save Sign in to save words Traditional (Taiwan): 未知數 On the HSK 7-9 vocabulary list, at CEFR level C2. wèizhīshù ㄨㄟˋ ㄓ ㄕㄨˋ unknown number an unknown an uncertainty fig. Character by character 未(wèi)not yet 知(zhī)know 数(shù)number A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0 国际中文教育中文水平等级标准, 中华人民共和国教育部, MIT