LATIN DICTIONARYLexicon Latīnum
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“libertine” in Latin

The English word libertine itself goes back to Latin līber, through libertinus.

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

libertine s.
A freedman, libertinus, etc.
A dissolute person, homo dissolutus; homo libidinosus or intemperans.
libertine adj.
dissolutus; libidinosus; intemperans. (The words are found in this connection and order.) libidinosus et intemperans.

Quick answer

What is the Latin word for libertine?
The usual Latin words for “libertine” are lībertīnus, intemperāns, dissolvō; also libīdinōsus. 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.