also: きんのうむけつ
noun
Describes something completely without defect, often used in formal or literary contexts. As a yojijukugo, it carries a classical, elevated tone.
彼の計画は金甌無欠に見えたが、実際にはいくつかの問題があった。
His plan seemed flawless, but in reality there were several problems.
noun
(a nation) never invaded by outside forces
Specifically refers to a nation that has maintained its sovereignty without ever being invaded. This is a historical and somewhat rare usage, often found in discussions of national integrity.
この国は長い歴史の中で金甌無欠を誇ってきた。
This country has prided itself on never having been invaded throughout its long history.
Both mean 'flawless' or 'perfect', but 完全無欠 is more common and less literary. 金甌無欠 carries a classical, elevated nuance and can also refer specifically to a nation's uninvaded history.
A yojijukugo of Chinese origin. 金甌 (kin'ō) means 'golden bowl' or 'golden vessel', symbolizing something precious and intact. 無欠 (muketsu) means 'without flaw'. Together, the phrase originally described a perfectly intact golden vessel, later extended to mean flawless or, in a political context, a nation that has never been invaded.