DictionaryRoot: vilain
Old French
vilain
peasant, commoner, churl
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adjective
villainous
VIL-uh-nus/ˈvɪlənəs/
Morally wicked or evil.
Etymology
“Peasant” became an insult for someone low-born or ill-mannered, then a label for a wicked person. The adjective describes conduct or character fitting that moralized insult.