不倫
Common
Noun
Irregular
Intransitive
I-adj
Noun
1
noun (common) (futsuumeishi)noun or participle which takes the aux. verb suruintransitive verbadjectival nouns or quasi-adjectives (keiyodoshi)nouns which may take the genitive case particle 'no'
adultery;impropriety;(an) affair;immorality
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?