The Oxford Thesaurus An A-Z Dictionary of Synonyms - libertine n.

1) lecher, reprobate, profligate, rake, rakehell, rou‚, debaucher, womanizer, seducer, fornicator, adulterer, debauchee, whoremonger, philanderer, Don Juan, Lothario, Casanova, Colloq wolf, lady-killer, (old) goat, dirty old man: He fancied himself a libertine, but women shunned him like the plague. --adj. 2) licentious, lecherous, reprobate, profligate, rakish, rakehell, philandering, dissolute, immoral, degenerate, depraved, debauched, decadent, dirty, filthy, amoral, wanton, lewd, lascivious, prurient, lubricious or lubricous, salacious, Paphian, libidinous, ruttish, goatish, hircine, satyric(al) , carnal, bestial, Colloq randy, Slang horny: A paragon of prudery to his family, Viscount Guarnier secretly led a life of wild, libertine abandon.