enervation vs indisposition

enervation

noun
  • State of being enervated; debility. 

  • Act of enervating; debilitation. 

indisposition

noun
  • A mild illness, the state of being indisposed. 

  • A state of not being disposed to do something; disinclination; unwillingness. 

  • A bad mood or disposition. 

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