dogmatism vs spinelessness

dogmatism

noun
  • The manner or character of a dogmatist; arrogance or positiveness in stating opinion. 

spinelessness

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

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