firmness vs grossness

firmness

noun
  • security; steadfastness; good grip 

  • strictness; mental strength 

  • physical durability; rigidness (of material) 

grossness

noun
  • The quality of being repulsive or disgusting. 

  • Lack of refinement in character, behaviour etc.; coarseness. 

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