richness  
noun [ U ] uk/ˈrɪtʃ.nəs/ us/ˈrɪtʃ.nəs/
  (A LOT OF STH)      
 C1 丰富;富饶
the quality of having a lot of something that is valuable or interesting
  We were impressed by the great richness of detail in her painting. 她的画作着重细节刻画,给我们留下很深的印象。 
   (ATTRACTIVE)      
 C1 (颜色)浓重的;(声音)浑厚的,圆润洪亮的;(味道)馥郁的
the quality of looking, sounding, smelling, or tasting strong in a pleasing or attractive way
  richness of flavour 香味馥郁 
 It's a wonderful painting - I love the richness of the colours. 这是一幅极好的画作——我喜欢其浓重的色彩。 
   (FOOD)      
 (食物)油腻
the fact that a food contains a large amount of butter, oil, eggs, or cream
  The richness of the food made him feel slightly ill. 食物太油腻了,他吃了觉得有些不适。