sicko vs unhealthy

sicko

adj
  • Characterized by depraved tastes or habits; deviant. 

noun
  • A person with unpleasant tastes, views or habits. 

  • A physically ill person. 

  • A mentally ill person. 

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