spinelessness vs weakness

spinelessness

noun
  • The state or quality of being spineless (not having a spine (literally or figuratively)); cowardice. 

weakness

noun
  • The condition of being weak. 

  • An inadequate quality; fault 

  • A special fondness or desire. 

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