Definition: (adjective) Unrestrained by convention or morality.
Synonyms: debauched, degenerate, degraded, dissipated, dissolute, profligate, riotous, fast.
Usage: Such an expression is often mistaken for manly frankness, when in truth it arises from the reckless indifference of a libertine disposition … totally unconnected with personal merit.
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Source: The Free Dictionary