(a.) Contrary to conscience or the divine law; wicked; unjust\; dishonest; vicious; licentious; as, an immoral man; an immoral deed.

abandoned amoral bad base carnal concupiscent conscienceless corrupt corrupted criminal crooked dark debauched degenerate depraved devious dirty dishonest dishonorable dissolute doubtful dubious evasive evil felonious filthy fishy flagitious fraudulent ill-got ill-gotten immodest impure indecent indirect iniquitous insidious lascivious lecherous lewd libertine libidinous licentious lustful nefarious nonmoral not kosher obscene pornographic questionable reprobate rotten salacious shady shameless shifty sinful sinister slippery smutty steeped in vice suspicious treacherous tricky unchaste unclean uncleanly unconscienced unconscientious unconscionable underhand underhanded unethical unmoral unprincipled unregenerate unsavory unscrupulous unstraightforward vice-laden vice-prone vicious vile villainous wanton wicked without remorse without shame wrong