daft as a brush vs demented

daft as a brush

adj

  • Tending to do or say silly things. 

demented

adj

  • Crazy; ridiculous. 

  • Insane or mentally ill. 

  • a demented idea 

  • Suffering from dementia. 

How often have the words daft as a brush and demented occurred in a corpus of books? (source: Google Ngram Viewer )