noun
A yojijukugo meaning flawless or perfect in all aspects, with no shortcomings. Rare and literary; not used in everyday conversation.
彼の演技は面向不背の出来栄えだった。
His performance was flawless.
この計画は面向不背とは言えないが、十分に実用的だ。
This plan is not flawless, but it is practical enough.
A yojijukugo composed of 面 (every direction), 向 (facing), 不 (not), and 背 (turning one's back), literally meaning 'facing all directions and turning one's back on none,' i.e., flawless from every angle. The exact historical origin is uncertain.