wàn​wú​yī​shī HSK7

surefire

万无一失 (萬無一失) wàn​wú​yī​shī
surefire idiom
absolutely safe; foolproof; no risk of failure

To ensure the plan is foolproof, we must carefully check every detail.

Frequency

Movie subtitles
2.56 per million appears in 1% of films
Written text
1.81 per million

Details

HSK 3.0
Level 7

Sources

Definitions
CC-CEDICT