noun which may take the genitive case particle 'no', na-adjective, noun
invalid; void; ineffective; unavailable
Describes something that has no legal force, effect, or validity. Common in legal, technical, and everyday contexts. Antonym: 有効.
Antonyms: 有効
このパスポートは期限が切れているので無効です。
This passport is invalid because it has expired.
The contract became void.
その対策は結局無効だった。
That measure was ineffective after all.