American Oxford Dictionaries:
criminal |ˈkrimənl|
noun
a person who has committed a crime : these men are dangerous criminals.
adjective
of or relating to a crime : he is charged with conspiracy to commit criminal damage.
• Law of or relating to crime as opposed to civil matters : a criminal court.
• informal (of an action or situation) deplorable and shocking : he may never fulfill his potential, and that would be a criminal waste.
DERIVATIVES
criminality |ˌkriməˈnalitē| noun
criminally adverb
ORIGIN late Middle English (as an adjective): from late Latin criminalis, from Latin crimen, crimin- (see crime ).
Thesaurus
criminal
noun
a convicted criminal lawbreaker, offender, villain, delinquent, felon, convict, malefactor, wrongdoer, culprit, miscreant; thief, burglar, robber, armed robber, gunman, gangster, terrorist; informal crook, con, jailbird, hood, yardbird, perp; Law malfeasant.
adjective
1 criminal conduct unlawful, illegal, illicit, lawless, felonious, delinquent, fraudulent, actionable, culpable; villainous, nefarious, corrupt, wrong, bad, evil, wicked, iniquitous; informal crooked; Law malfeasant. antonym lawful.
2 informal : a criminal waste of taxpayers' money deplorable, shameful, reprehensible, disgraceful, inexcusable, unforgivable, unconscionable, unpardonable, outrageous, monstrous, shocking, scandalous, wicked. antonym commendable.
SOURCE
American Oxford Dictionaries, Version 1.0.2, 2005