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Invalid, void, or ineffective (legally or functionally)
無効なパスポートは国外旅行に使えません
An invalid passport cannot be used for international travel.
Commonly used in legal contexts to describe something that lacks legal force or effect.
Not working or ineffective
このコードは無効です
This code is invalid.
In legal contexts, 無効 refers to something that is legally void, while in general contexts, it can mean something that is not working or effective.
In legal documents, 無効 is often used to describe contracts or actions that are legally invalid.
Composed of 無 (mu, 'not') and 効 (kō, 'effect'), literally meaning 'without effect'.
In legal contexts, 無効 is often used to describe contracts, documents, or actions that are legally void. In everyday language, it can describe anything that is not functional or effective.