few cards shy of a full deck vs unhealthy

few cards shy of a full deck

adj

  • mentally deranged; demented; insane. 

unhealthy

adj

  • characterized by disturbed mental health 

  • characterized by, or conducive to poor health 

  • tending to corrupt 

  • sick or ill 

How often have the words few cards shy of a full deck and unhealthy occurred in a corpus of books? (source: Google Ngram Viewer )