delightful vs off-color

delightful

adj
  • Pleasant; pleasing, bringing enjoyment, satisfaction, or pleasure. 

off-color

adj
  • Dirty, vulgar or obscene, especially in a way that is unpleasant. 

  • Feeling mildly unwell. 

  • Different than usual. 

  • Of the wrong color. 

How often have the words delightful and off-color occurred in a corpus of books? (source: Google Ngram Viewer )