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noun (common) (futsuumeishi), noun or participle which takes the aux. verb suru, intransitive verb, adjectival nouns or quasi-adjectives (keiyodoshi), nouns which may take the genitive case particle 'no'
adultery, impropriety, (an) affair, immorality
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隣の人が若い女の人と不倫しているらしいよ。
Did you hear that our neighbor was fooling around with a younger woman?
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