万无一失
wàn wú yī shī · HSK 7
absolutely safe
🎯 万无一失 = ten-thousand (万) + without (无) + one (一) + slip (失): not one loss in ten thousand
Literally ten thousand tries without a single lapse. The 一失 (one slip) being absent is what makes it surefire: zero failures across countless attempts, so a plan described this way is considered absolutely safe.
万 — top 一 + 𠃌 (hook) over 丿
Originally a pictograph of a scorpion, used in oracle bone script. It was borrowed phonetically to mean 'ten thousand' and the original scorpion sense was lost. The traditional form 萬 shows the scorpion more clearly; 万 is a simplified variant long used as a common shorthand.
无 — top 一 + 林-like middle + fire radical 灬 below
Originally a pictograph of a person dancing while holding ornaments or tassels, meaning 'to dance' — the ancestor of 舞. It was borrowed phonetically to write the negative 'not have / without,' and the dance meaning was reassigned to 舞 with an added foot element. The simplified form 无 comes from an ancient variant.
一 — single horizontal stroke
一 is one of the simplest pictographs in Chinese, depicting a single horizontal line to represent the number one. It has retained essentially the same form since oracle bone script over 3,000 years ago. By extension it also means 'first,' 'whole,' or 'same.'