morbific vs unhealthy

morbific

adj
  • Pertaining to or caused by disease; diseased. 

  • That causes disease; sickening, pathogenic. 

unhealthy

adj
  • characterized by, or conducive to poor health 

  • characterized by disturbed mental health 

  • tending to corrupt 

  • sick or ill 

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