inclemency vs unkindness

inclemency

noun
  • The quality of being inclement; lack of clemency. 

  • Something that is inclement. 

unkindness

noun
  • The state or quality of being unkind. 

  • An unkind act. 

  • The collective noun for ravens 

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