daft as a brush vs dotty

daft as a brush

adj

  • Tending to do or say silly things. 

dotty

adj

  • Mildly insane or eccentric; often, senile. 

  • Having many dots. 

noun

  • A shotgun. 

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