balmy vs mad as a mongoose

balmy

adj
  • Foolish; slightly crazy or mad; eccentric. 

  • Producing balm. 

  • Soothing or fragrant. 

  • Of weather, mild and pleasant. 

mad as a mongoose

adj
  • Demented or crazy. 

How often have the words balmy and mad as a mongoose occurred in a corpus of books? (source: Google Ngram Viewer )