Detail word “無効”
むこう
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mu/ko–‾
☆ adjectival nouns or quasi-adjectives (keiyodoshi)
☆ kind. n
☆ kind. adj-no
◆ invalid, no effect, unavailable, illegal
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If you were forced to sign the contract, it's invalid.
Antonym
  • 有効
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The kanji
効 「コウ」
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Kanji radicals:
訓: き.く ききめ なら.う
音: コウ
無 「ム ブ」
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Kanji radicals:
訓: な.い
音: ム ブ