decadent

Etymology

From French décadent, back-formation from décadence, from Medieval Latin decadentia, from Late Latin decadens, present participle of decadō (“sink, fall”). Cognate with French décadent.

adj

1. Characterized by moral or cultural decline.
   As societies grow decadent, the language grows decadent, too. Words are used to disguise, not to illuminate, action: you liberate a city by destroying it. Words are to confuse, so that at election time people will solemnly vote against their own interests. 1992, Gore Vidal, The Decline and Fall of the American Empire
2. Luxuriously self-indulgent.
   2003, Hedonismbot in the Futurama episode "The Devil's Hands Are Idle Playthings" Surgery in an opera? How wonderfully decadent! And just as I was beginning to lose interest!

noun

1. A person affected by moral decay.
   L. Douglas He had the fastidiousness, the preciosity, the love of archaisms, of your true decadent.