off-color vs rude

off-color

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

  • Feeling mildly unwell. 

  • Different than usual. 

  • Of the wrong color. 

rude

adj
  • Somewhat obscene, pornographic, offensive. 

  • Violent; abrupt; turbulent. 

  • Lacking in refinement or civility; bad-mannered; discourteous. 

  • Undeveloped, unskilled, inelegant. 

  • Hearty, vigorous; found particularly in the phrase rude health. 

  • Crudely made; primitive. 

  • Lacking refinement or skill; untaught; ignorant; raw. 

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