The process whereby a seller intentionally hides the defects of his goods so that an unsuspecting buyer would acquire them at the list price. It may also involve glossing the goods over, bestowing thereon a more appealing appearance or functionality. Tadlees al-aib may be also practiced by buyers who use fake currency in settlement of a purchase transaction. Shari’a outspokenly prohibits such deceptive practices. To protect them, shari’a equips buyers/ sellers with the so-called khiyar al-tadlees whereby the defrauded buyer/seller is given the option to rescind the transaction and redeem the price paid or the commodity delivered.

Tadlees al-aib (in Arabic script: تدليس العيب) translates as fraudulent concealment of defects.