criminal

bad, evil, immoral, shameful, sinful, unethical, wicked, wrong

blamable, blameworthy, censurable, reprehensible

banned, barred, contraband, criminalized, disallowed, discouraged, forbidden, interdicted, outlawed, prohibited, proscribed

adulterine, bootleg, unauthorized, unlicensed, unsanctioned

under-the-counter, under-the-table

corrupt, unprincipled, unscrupulous, villainous

misdemeanant

accomplice, principal

desperado, outlaw

convict, jailbird

perp, perpetrator

evildoer, gallows bird, misdoer, misfeasor, sinner, transgressor, trespasser, villain, wrongdoer

blackhander, button man, gangster, hoodlum, hooligan, mobster, racketeer, thug

enforcer, gun, gunman, gunsel [slang], hit man, triggerman

backslider, recidivist, relapser, repeater

accused, arrestee, defendant, detainee, fish, suspect