unoccupied vs untenanted

unoccupied

adj
  • Not inhabited, especially by a tenant 

  • Not occupied by foreign troops etc 

  • Not being used; vacant or free 

  • Not employed on a task; idle 

untenanted

adj
  • Not leased to or occupied by a tenant; unoccupied. 

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