indifferent to moral restraints; given to immoral or improper conduct; licentious; dissipated.

1350–1400; Middle English (< Anglo-French) < Latin dissolūtus (past participle of dissolvere to dissolve). See dis-1, solute

dissolutely, adverb
dissoluteness, noun
undissolute, adjective

desolate, dissolute (see synonym study at desolate).

corrupt, loose, debauched, wanton, abandoned.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dissolute (ˈdɪsəˌluːt)
given to dissipation; debauched
[C14: from Latin dissolūtus loose, from dissolvere to dissolve]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 14c., from L. dissolutus, pp. of dissolvere "loosen up" (see dissolve). Intermediate sense of "lax" led to modern meaning of "unrestrained in morals" (1510s).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Some were for the swamp, some for a dissolute motel scene.
Cherie quickly segues from sassy-sweet to dissolute and foul-mouthed.
This was perfectly in keeping with his dissolute, bourgeois-baiting public
Today, he is a born-again family man who testifies for church groups on his
  formerly dissolute days.
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