Etymology
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villainous (adj.)

c. 1300, "offensive, abusive," from Old French vileneus "worthless, base," from vilain (see villain). Sense of "despicable, shameful, morally corrupt" is from c. 1400 in English. Related: Villainously; villainousness.

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Definitions of villainous

villainous (adj.)
extremely wicked;
a villainous plot
a villainous band of thieves
Synonyms: nefarious
From wordnet.princeton.edu