adust vs sad

adust

adj
  • Hot and dry; thirsty or parched. 

  • Of a bodily humour: abnormally dark or over-concentrated (associated with various states of discomfort or illness, specifically being too hot or dry). 

sad

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

  • Soggy (to refer to pastries). 

  • Causing sorrow; lamentable. 

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

  • Appearing sorrowful. 

  • Feeling sorrow; sorrowful, mournful. 

  • Unfashionable; socially inadequate or undesirable. 

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