In a way that shows waste, excess, or indulgent living; in a scattered or dispersed manner.
From dissipated (adjective, meaning scattered or spent excessively) + -ly (adverb suffix). Dissipated originally meant 'dispersed' but evolved to mean 'morally loose or dissolute.'
In 18th-century literature, a 'dissipated' person was someone who scattered their energy and money on wild pleasures—think of Dorian Gray living dissipatedly!
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