noun which may take the genitive case particle 'no', na-adjective, noun
Describes something without any flaws, defects, or shortcomings. Often used in formal or literary contexts.
彼の演技は無欠の出来だった。
His performance was flawless.
この計画は無欠とは言えないが、十分に練られて
This plan is not perfect, but it has been well thought out.
完璧 is the common word for 'perfect' or 'flawless' in everyday speech. 無欠 is more formal and literary, often used in written language or set phrases.
Compound of 無 (mu, 'without') and 欠 (ketsu, 'lack' or 'flaw'). The spelling 無缺 uses the older form 缺 for 欠.