ILLEGAL

[adjective] - (esp. of an activity or action) against the law; not allowed by lawa campaign to stop the illegal sale of cigarettes to children under 16Prostitution is illegal in some countries.It is illegal to drive a car that it is not taxed and insured.Cocaine, LSD and heroin are all illegal drugs/substances.An illegal immigrant is a person who has entered a country in order to live there, without having any legal right to do so.