niceness vs severity

niceness

noun
  • Pleasantness, especially of behaviour or personality; agreeableness. 

  • A value determining how much processor time to concede to a running process. (See also nice (verb), renice.) 

  • Effeminacy; indulgence in soft living or luxuriousness. 

  • Fastidiousness; fine sensitivity. 

severity

noun
  • The degree of something undesirable; badness or seriousness. 

  • The state of being severe. 

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