unfun vs unpalatable

unfun

noun

  • Lack or absence of fun; funlessness. 

adj

  • Not fun. 

unpalatable

noun

  • Anything distasteful. 

adj

  • Unpleasant or disagreeable. 

  • Unpleasant to the taste. 

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