Libertine

noun: a free thinker, usually used disparagingly; one without moral restraint.

1: usually disparaging : a freethinker especially in religious matters
2: a person who is unrestrained by convention or morality; specifically : one leading a dissolute life

The libertine took pleasure in gambling away his family's money.

The legend of Don Juan depicts him as a playboy and libertine.

Synonym: hedonist