無む効こう

む

こ

う

Common wordJLPTN1Freq.FrequencyTop 5,000

Meanings

1

noun which may take the genitive case particle 'no', na-adjective, noun

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き限げんが切きれているので無む効こうです。

This passport is invalid because it has expired.

契けい約やくは無む効こうになった。

The contract became void.

その対たい策さくは結けっ局きょく無む効こうだった。

That measure was ineffective after all.

〈事こと〉が無む効こうになるfor something (a contract, ticket, vote, etc.) to become invalid
サインがなかったため、契けい約やくが無む効こうになった。
Because there was no signature, the contract became invalid.
〈事こと〉を無む効こうと判はん断だんするto judge/rule that something is invalid
裁さい判ばん所しょはその選せん挙きょを無む効こうと判はん断だんした。
The court ruled that the election was invalid.

失しっ効こう
失効 specifically means a right or agreement has lapsed or expired, while 無効 more broadly means something lacks validity or effect from any cause.
チャラ
無効 is a formal, legal-sounding word meaning 'invalid/null', whereas チャラ is a casual slang term for calling something even or forgotten.

有ゆう効こうN2
valid; effective; in effect · yuko (judo)
通つう用ようN2
無効 means invalid or no longer effective, the opposite of 通用 in the sense of something being validly accepted.
実じっ効こう
無効 means having no effect or being invalid, the direct opposite of 実効, which means having a real, working effect.

Compound of 無 (mu, 'without') and 効 (kō, 'effect'). The reading むこう is the on'yomi of both characters.

効こう力りょく

N2

無効 means 'invalid' or 'null and void', the opposite of having 効力 (legal force or effect).

無む効こう投とう票ひょう

invalid vote; spoiled ballot

reactive power

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