What does 無効 mean?
無効 is a Japanese noun meaning “invalid, no effect, unavailable” in English. It is written as 無効 in kanji, むこう in hiragana, and mukou in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
脅迫のもとになされた約束は無効だ。
A promise given under a threat is worthless.