LATIN DICTIONARYLexicon Latīnum
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“villain” in Latin

The English word villain itself goes back to Latin vīlla, through vīllānus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

villain
A bad, worthless fellow, homo malus, improbus: homo nequam. (The words are found in this connection and order.) nequam et improbus: homo scelestus, sceleratus, consceleratus: homo perditus or profligatus: homo nefarius et improbus: homo sine religione ulla ac fide. A detestable villain, profligatissimus omnium mortalium ac perditissimus. homo omnium sceleratissimus: a manifest villain, homo foedus et aperte malus: a crafty villain, homo ingeniosissime nequam (Velleius): villain! scelus! (as abusive exclamation).
Serf, adscriptus glebae: servus (general term for slave): mancipium (bought or taken in war): verna (one born in the house).

Quick answer

What is the Latin word for villain?
The usual Latin words for “villain” are improbus, scelerō, cōnscelerō; also prōflīgō, servus, mancipium. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.