Contrary to or forbidden by law, especially criminal law.
Forbidden by established rules.
Totally fictitious, and often issued on behalf of a non-existent territory or country.
Being or doing something illegally.
Being an illegal immigrant; residing in a country illegally.
An illegal act or technique.
Contraband, esp. illegal substances such as drugs.
An illegal immigrant.
A spy working abroad illegally and undercover, without visible ties to his or her country’s authorities.
Not approved by law, but not invalid.
Breaking social norms.
Unlawful.
A banned or unlawful item.