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Definition of immoral : Not moral; inconsistent with rectitude, purity, or good morals; contrary to conscience or the divine law; wicked; unjust; dishonest; vicious; licentious; as, an immoral man; an immoral deed.

Synonyms:

vicious, right, abominable, reprobate, riotous, illegal, good, scrofulous, degraded, nefarious, culpable, shameless, libertine, evil, mean, basal, disgraceful, vile, unlawful, baseborn, profligate, flagitious, guilty, perverted, sex, dissipated, humble, shameful, lowly, unchaste, wrong, peccant, uncleanly, unethical, fast, meanspirited, dishonourable, unprincipled, restraint, dissolute

dishonest, hypocritical, crafty, treacherous, turncoat, insincere, devious, fraudulent, unscrupulous, crooked, dishonorable, prevaricating, underhanded, deceiving, traitorous, untrustworthy, deceitful, cheating, double-faced

corrupt, improper, felonious, iniquitous, depraved, scandalous, debauched, lawbreaking, indecent, perverse, sinful, debased, wicked, sadistic, bad, obnoxious, criminal, wrongdoing, reprehensible, damnable, blameworthy, base, shocking, sinister, misdoing, villainous, degenerate, black, evildoing

imperfect, blemished, slovenly, impure, obscene, sordid, defective, dirty, unclean

Usage examples:

• At least unless you're downright immoral, don't you know. - "Major Barbara", George Bernard Shaw.
• These doctrines agree in admitting the fact, that there are among mankind certain notions respecting right and wrong,- moral and immoral actions; and they then profess to account for these impressions,- or to explain how men come to think one action right and another wrong. - "The Philosophy of the Moral Feelings", John Abercrombie.
• For a moment Mr. Knight could think of no answer to these arguments, but Sir John having recovered his breath, attacked again: Look here, young fellow, I have no time to listen to jaw about the Bible and moral and immoral and all that bosh, which you can have out with your reverend parent afterwards. - "Love Eternal", H. Rider Haggard.