low-mindedness vs unkindness

low-mindedness

noun
  • The characteristic of being low-minded; vulgarity or lack of honor. 

unkindness

noun
  • The state or quality of being unkind. 

  • An unkind act. 

  • The collective noun for ravens 

How often have the words low-mindedness and unkindness occurred in a corpus of books? (source: Google Ngram Viewer )