sad vs suicidal

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. 

suicidal

adj
  • Pertaining to suicide. 

  • Likely to commit, or to attempt to commit, suicide. 

  • Extremely reckless. 

  • Highly likely to certain to result in the deaths of the participants; dangerous or reckless to such a degree as to be tantamount to suicide for those taking part. 

noun
  • Someone suicidal; someone likely to kill themselves. 

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