不成 On the HSK 6 vocabulary list, at CEFR level C2. bùchéng ㄅㄨˋ ㄔㄥˊ won't do unable to (at the end of a rhetorical question) can that be? 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