disease-free vs unhealthy

disease-free

adj
  • free of disease, not having, carrying, or suffering from any disease. 

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 disease-free and unhealthy occurred in a corpus of books? (source: Google Ngram Viewer )