lustful beast; lascivious monster
A term for a creature or person driven by intense sexual desire, often used in literary, mythological, or figurative contexts. Can carry a strong negative or condemnatory tone.
In that legend, a lustful beast that attacks the village appears.
When he gets drunk, he becomes like a lascivious monster.
Compound of 淫 (いん, 'lewd, licentious') and 獣 (じゅう, 'beast, animal'). The exact origin is uncertain, but it likely arose as a literary or mythological term to describe monstrous beings driven by lust.