disuse vs inadequacy

disuse

noun

  • The state of not being used; neglect. 

verb

  • To cease the use of. 

inadequacy

noun

  • The state of being inadequate. 

  • A lack of competence or ability. 

  • A shortage of required material. 

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