louche

This term describes a specific blend of sleaziness and sophistication. It is not used for raw or obvious vulgarity, but rather for a type of disreputability that is masked by a veneer of glamour, decadence, or high-society polish. It often evokes an atmosphere of smoky rooms, illicit deals, and a deliberate disregard for conventional morality.

In social contexts, it carries a judgmental tone, suggesting that the subject's charm is deceptive or predatory. While it can occasionally be used with a hint of ironic admiration for a "bad boy" persona, it generally signals a lack of integrity and a preference for the seedier side of luxury.