deranged vs round the bend

deranged

adj
  • Insane. 

  • Malfunctioning or inoperative. 

  • Disturbed or upset, especially mentally. 

round the bend

prep
  • Crazy, mad or insane. 

  • Close to or in close proximity to another location. 

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