Sentence:  The halls and passages of the castle were already permeated with rich and <WSD>unctuous</WSD> smells, and a delicate nose might have picked out and arranged, by their finer or coarser vapors, the dishes preparing for the upper and lower tables. 
Meaning of the word marked with <WSD> tags:  Rich, lush, intense, with layers of concentrated, soft, velvety flavor.