morbid vs sad

morbid

adj
  • Suggesting the horror of death; macabre or ghoulish. 

  • Of, or relating to disease. 

  • Grisly or gruesome. 

  • Taking an interest in, or fixating on, unhealthy or unwholesome subjects such as death, decay, disease. 

sad

adj
  • Causing sorrow; lamentable. 

  • Soggy (to refer to pastries). 

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

  • Appearing sorrowful. 

  • Feeling sorrow; sorrowful, mournful. 

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

  • Unfashionable; socially inadequate or undesirable. 

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