indisposition vs willingness

indisposition

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

  • A bad mood or disposition. 

  • A mild illness, the state of being indisposed. 

willingness

noun
  • The state of being willing 

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