unfun vs upsetting

unfun

noun

  • Lack or absence of fun; funlessness. 

adj

  • Not fun. 

upsetting

noun

  • The action of the verb upset. 

adj

  • Causing upset; distressing. 

  • Conceited; presumptuous. 

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