filthy vs off-color

filthy

adj
  • Obscene or offensive. 

  • Covered with filth; very dirty. 

  • Very unpleasant or disagreeable. 

verb
  • To make very dirty; to saturate something with dirt. 

  • To cover in filth. 

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 filthy and off-color occurred in a corpus of books? (source: Google Ngram Viewer )