万无一失 wàn wú yī shī

DEFINITIONS

  1. surefire; absolutely safe (idiom)

CHARACTERS

万 wàn
HSK 3
ten thousand; innumerable
无 wú
HSK 4
negative, no, not; KangXi radical 71
一 yī
HSK 1
one; a, an; alone
失 shī
HSK 4
lose; make mistake, neglect