Criminal

1. Guilty of crime or sin.
2. Involving a crime; of the nature of a crime; -- said of an act or of conduct; as, criminal carelessness.
3. Relating to crime; -- opposed to civil; as, the criminal code.
Criminal action (Law),
an action or suit instituted to secure conviction and punishment for a crime.
Criminal conversation (Law),
unlawful intercourse with a married woman; adultery; -- usually abbreviated, crim. con.
Criminal law ,
the law which relates to crimes.

1. One who has commited a crime; especially, one who is found guilty by verdict, confession, or proof; a malefactor; a felon.