inept vs unlivable

inept

adj
  • Unfit; unsuitable. 

  • Not able to do something; not proficient; displaying incompetence. 

unlivable

adj
  • Unfit to be lived in; uninhabitable. 

  • That cannot be lived. 

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