萬無一失

• Pinyin: wàn wú yī shī
• English Definitions: surefire; absolutely safe (idiom)
• Notes: Classifiers: Other transcriptions: numeric: wan4 wu2 yi1 shi1, wadegiles: wan⁴ wu² i¹ shih¹, bopomofo: ㄨㄢˋ ㄨˊ ㄧ ㄕ, romatzyh: wann wu i shy