JMdict: 1529930

無効 【むこう】

  1. [adj-no,adj-na,n] invalid; void; ineffective; unavailable
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
Nothingness, None, Ain't, Nothing, Nil, Not ム, ブ な.い
Merit, Efficacy, Efficiency, Benefit コウ き.く, ききめ, なら.う

Words often seen with this one: (experimental feature)

超人 (18), こと (14), その (14), 遺言 (10)