An illegal immigrant.
Contraband, esp. illegal substances such as drugs.
A spy working abroad illegally and undercover, without visible ties to his or her country’s authorities.
Contrary to or forbidden by law, especially criminal law.
Breaching certain enacted statutes of positive law; not lawful, not legal (cf. immoral, unethical)
Forbidden by established rules.
Being or doing something illegally.
Being an illegal immigrant; residing in a country illegally.
Totally fictitious, and often issued on behalf of a non-existent territory or country.