Synonyms for Libertine (same or very similar meaning)
WordNet sense 1 (a dissolute person; usually a man who is morally unrestrained):
debauchee, rounderWordNet sense 2 (unrestrained by convention or morality):
debauched, degenerate, dissipated, dissolute, fast, profligate, riotous, degraded, degenerateWordNet sense 3 (deliberately violating accepted principles of right and wrong):
immoralFrom the ODE community, based on WordNetadd/edit