Synonyms for Criminal:

adj.

bad (adjective)
wicked.
crooked (adjective)
shady.
deplorable (adjective)
condemnable.
illegal (adjective)
illegitimate, punishable, forbidden, unconstitutional, actionable, illegal, offensive, taboo, verboten, unjust, unauthorized, wrongful, unlawful, felonious, lawless, unlicensed, bootleg, illicit.
lawless, felonious (adjective)
illicit, immoral, scandalous, deplorable, illegitimate, iniquitous, unlawful, wicked, shady, wrong, corrupt, villainous, illegal.
unconscionable (adjective)
amoral.
wicked (adjective)
evildoing, iniquitous, indecent, sadistic, bad, perverse, immoral, damnable, wicked, sinful, wrongdoing, shocking, black, sinister, Misdoing, felonious, lawbreaking, debauched, depraved, degenerate, debased, base, obnoxious, reprehensible, villainous, blameworthy, scandalous, corrupt, improper.

n.

shady, clandestine, fraudulent. gross, deviant, perverted, unethical, amoral, sordid, Crimes. criminally, common-law, enabling, civil, forensic, antitrust, effective, extrajudicial, extraterritorial. ringleader, accomplice, juvenile, underworld, gang. bad person (noun)
lecher, slattern, bad guy, malingerer, heel, knave, rogue, hog, rascal, pervert, rapscallion, degenerate, shyster, reprobate, miscreant, pig, villain, jezebel, traitor, slob, scoundrel, swine, backslider, scamp, blackguard.
bandit (noun)
pirate.
criminal (noun)
felon, malefactor, crook, condemnable, wrong, felonious, guilty, illegal, deplorable, outlaw, reprehensible.
deceiver (noun)
charlatan, Defrauder, deceiver, cheat, imposter, phony, fake, forger, fraud, counterfeiter, con man, con artist.
deserter (noun)
backslider.
evildoer (noun)
gunman, evildoer, hooligan, brute, monster, tyrant, vulture, tough, vampire, ruffian, cutthroat, desperado, bully, hoodlum, snake, law breaker, viper, terrorist, vandal, wrongdoer, thief, fiend, ogre, demon, crook, thug.
perpetrator (noun)
offender.
person (noun)
felon, malefactor, outlaw, crook.
person who breaks the law (noun)
evildoer, wrongdoer, hooligan, culprit, desperado, felon, offender, delinquent, thug, crook, outlaw, lawbreaker, convict, hoodlum, jailbird, malefactor, scofflaw.
prisoner (noun)
captive, suspect, lifer, convict, recidivist, scofflaw, loser, offender, prisoner, jailbird, internee, defendant.
thief (noun)
housebreaker, larcener, pickpocket, poacher, culprit, pirate, outlaw, felon, delinquent, swindler, mugger, larcenist, lawbreaker, Grafter, burglar, highwayman, cat burglar, stealer, hijacker, lifter, Filcher, prowler.

Other synonyms:

effective, antitrust, extrajudicial, enabling, extraterritorial, criminally. civil. gang. juvenile. malefactor
malefactor.
Other relevant words:
effective, fraudulent, deplorable, juvenile, amoral, deviant, extraterritorial, gross, unethical, malefactor, guilty, wrong, perverted, criminally, extrajudicial, shady, condemnable, enabling.

Usage examples for criminal

  1. True, the criminal works for the government without pay; and well he may. – The Anti-Slavery Examiner, Omnibus by American Anti-Slavery Society
  2. He had no doubt whatever that Fogg would remain some time in Bombay- we know that was also Passe- partout's notion- and the warrant would probably arrive before the criminal left the town. – Round the World in Eighty Days by Jules Verne
  3. Instead, they find out who it is that the criminal most loves. – The Eel by Miriam Allen DeFord