And in addition, only a person thoroughly grounded in Ingsoc could appreciate the full force of the word bellyfeel, which implied a blind, enthusiastic acceptance difficult to imagine today; or of the word oldthink, which was inextricably mixed up with the idea of wickedness and decadence.
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.