Prohibited by law, proclamation, or treaty, to be imported or exported: as contraband goods, etc. So contraband trade, contraband trader: trade…

Of goods: moved into or out of a country or area by illicit means, either to avoid the payment of duties or to circumvent legal restrictions…

Imported, brought in, conveyed, etc., by stealth.

That smuggles, or is engaged in smuggling. Of vessels.

illicit, smuggled; also transferred.