loony vs sad

loony

adj
  • Insane. 

  • Very silly, absurd. 

noun
  • An insane or very foolish person. 

sad

adj
  • Appearing sorrowful. 

  • Soggy (to refer to pastries). 

  • Causing sorrow; lamentable. 

  • Of colours: dark, deep; later, sombre, dull. 

  • Feeling sorrow; sorrowful, mournful. 

  • Poor in quality, bad; shameful, deplorable; later, regrettable, poor. 

  • Unfashionable; socially inadequate or undesirable. 

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