Zhè wèi yìshùjiā yǐ fàngdàngbùjī de shēnghuó fāngshì wénmíng.
This artist is known for his dissolute and unrestrained lifestyle.
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usage
放荡不羁 generally carries a negative moral connotation (excessive, immoral), but can be used admiringly when describing a free-spirited, unconventional artist or wanderer.