chemically imbalanced vs few cards shy of a full deck

chemically imbalanced

adj

  • Mentally ill. 

  • Used other than figuratively or idiomatically: see chemically, imbalanced. 

few cards shy of a full deck

adj

  • mentally deranged; demented; insane. 

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