adj guilty of crime or sin.
2. criminal ·adj relating to crime;
opposed to civil; as, the criminal code.
3. criminal ·adj involving a crime; of the nature of a crime;
said of an act or of conduct; as, criminal carelessness.
4. criminal ·noun one who has commited a crime; especially, one who is found guilty by verdict, confession, or proof; a malefactor; a felon.