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Definition of villainous : 1. Base; vile; mean; depraved; as, a villainous person or wretch.
2. Proceeding from, or showing, extreme depravity; suited to a villain; as, a villainous action.
3. Sorry; mean; mischievous; - in a familiar sense.

Synonyms:

unethical, miscreant, vile, rotten, nefarious, dark, unlawful, clean, good, unhealthy, vicious, wrong, flagitious, unrighteous, unsavory, evil

detestable, contrary, offensive, objectionable

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

devilish, fiendish, satanic, diabolical, atrocious

Usage examples:

• Beside Thelma's innocent white soul, mine looks villainous! - "Thelma", Marie Corelli.
• He felt nervous; the place was so uncouth and dark, the faces so villainous. - "Foul Play", Charles Reade Dion Boucicault.
• The deluge left nothing untouched, even little Wallachia, whose fortunate situation, wild mountains, and villainous roads had hitherto saved it from invasion, saw the approach of the conquering banners. - "The Slaves of the Padishah", Mór Jókai.