illicit love; forbidden love
Refers to a romantic relationship that is morally or socially unacceptable, such as an affair or a love that violates norms. Often carries a literary or dramatic tone.
He was lost in an illicit love affair with a married woman.
The novel depicts a forbidden love.
Compound of 邪 (ja, 'wicked, evil') and 恋 (ren, 'love'). The exact historical derivation is uncertain, but the word is formed from standard Sino-Japanese morphemes.