chemically imbalanced vs gaga

chemically imbalanced

adj

  • Mentally ill. 

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

gaga

adj

  • Mentally senile. 

  • Infatuated. 

  • Crazy. 

How often have the words chemically imbalanced and gaga occurred in a corpus of books? (source: Google Ngram Viewer )