black man vs saddening

black man

noun
  • A male adult member of an ethnic group having dark pigmentation of the skin, typically of sub-Saharan African descent; or the appearance thereof. 

  • Used other than figuratively or idiomatically: see black, man. 

saddening

noun
  • The darkening of a colour during dyeing. 

adj
  • Causing feelings of sadness. 

How often have the words black man and saddening occurred in a corpus of books? (source: Google Ngram Viewer )