lib·er·tine 
(lĭbər-tēn′)
(lĭbər-tēn′)n.
1. One who acts without moral restraint; a dissolute person.
2. One who defies established religious precepts; a freethinker.
adj.
Morally unrestrained; dissolute.
[Middle English, freedman, from Latin lībertīnus, from lībertus, from līber, free; see leudh- in the Appendix of Indo-European roots.]