mouldy vs unfun

mouldy

adj

  • Worthless; lousy; rotten. 

  • Covered with mould. 

  • Showing signs of neglect; disused. 

unfun

adj

  • Not fun. 

noun

  • Lack or absence of fun; funlessness. 

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