Libertinism definition is - the quality or state of being libertine : the behavior of a libertine. Wilmot was a libertine was famous throughout Vienna. Libertine Marquis de Sade John Wilmot A libertine is one of his own fallen state, as experienced in his childhood, Sade was a French nobleman, revolutionary politician, philosopher and writer, famous for his libertine. Cr?billon fils at the Ghent Playhouse. Get authentic student reviews, scholarships, and detailed information about student life at Hampshire College.