万无一失 Save Sign in to save words Traditional (Taiwan): 萬無一失 On the HSK 7-9 vocabulary list, at CEFR level C2. wànwúyīshī ㄨㄢˋ ㄨˊ ㄧ ㄕ surefire absolutely safe (idiom) Character by character 万(wàn)ten thousand 无(wú)not to have 一(yī)one 失(shī)lose 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