(a.) Malicious; villainous; showing criminal intent; done with intent to commit a crime; as, felonious homicide\.

actionable against the law amoral anarchic anarchistic anomic black-market bootleg chargeable conscienceless contraband contrary to law corrupt corrupted criminal crooked dark devious dishonest dishonorable doubtful dubious evasive evildoing fishy flawed fraudulent ill-got ill-gotten illegal illegitimate illicit immoral impermissible indirect iniquitous insidious irregular justiciable lawless malefactory malfeasant nonconstitutional nonlegal nonlicit not kosher outlaw outlawed punishable questionable rotten shady shameless shifty sinful sinister slippery suspicious triable tricky unallowed unauthorized unconscienced unconscientious unconscionable unconstitutional under-the-counter under-the-table underhand underhanded unethical unlawful unofficial unprincipled unsavory unscrupulous unstatutory unstraightforward unwarrantable unwarranted wicked without remorse without shame wrong wrongdoing wrongful