In the unholy crimson glow that bathed them, his dark profile stood out as clearly as the head on an ancient coin, beautiful, cruel and decadent.
Drink and dissipation had done their work on the coin-clean profile and now it was no longer the head of a young pagan prince on new-minted gold but a decadent, tired Caesar on copper debased by long usage.
There are no more uses of "decadent" in the book.
Show samples from other sources
So, sitting on the couch by myself, not talking, felt decadent.
Gillian Flynn -- Gone Girl
She slept decadently, eight to ten hours a day, could sleep anywhere—on a three-minute car ride, in the filthy booth of an off-campus diner, on anyone’s couch, at any time.