JLPT N1 · な-adjective

無効 (mukou)

無効 (むこう, mukou) is a Japanese な-adjective meaning “invalid; void”. It appears in JLPT N1 vocabulary lists and is marked as a common word in JMdict.

Reading: むこう
Romaji: mukou
Word class: な-adjective
Level: JLPT N1 (unofficial)

Meaning

invalid; void; ineffective; unavailable · noun taking の, な-adjective, noun

Example sentences

脅迫のもとになされた約束は無効だ。

A promise given under a threat is worthless.

Tatoeba #180083

Sentences from the Tatoeba project, linked to this word in JMdict.

Conjugation of 無効

な-adjective. Plain and polite forms below; try any other word in the Japanese verb conjugator.

Form	Japanese	Reading
Present (plain)	無効だ	むこうだ mukouda
Present (polite)	無効です	むこうです mukoudesu
Negative	無効じゃない	むこうじゃない mukoujanai
Past	無効だった	むこうだった mukoudatta
Negative past	無効じゃなかった	むこうじゃなかった mukoujanakatta
Te-form	無効で	むこうで mukoude
Before a noun	無効な	むこうな mukouna
Adverb (~ni)	無効に	むこうに mukouni

Kanji in 無効

無

nothingness, none, ain'tム・ブ・な.い · 12 strokes

効

merit, efficacy, efficiencyコウ・き.く・ききめ · 8 strokes

Related words

Other vocabulary sharing a kanji with 無効.

無くすなくすto lose (something)無理むりunreasonable無くなるなくなるto be lost (e.g. luggage)無むnothing有無うむexistence or nonexistence無視むしdisregarding無駄むだfutility無料むりょうfree (of charge)無しなしwithout無事ぶじsafety無ぶun-無限むげんinfinity無地むじplain無数むすうinnumerable

Source: JMdict entry 1529930 (EDRDG, CC BY-SA 4.0). Level: unofficial JLPT list – how levels are assigned.