riven vs unbroken

riven

adj
  • Broken into pieces; split asunder. 

  • Torn apart. 

unbroken

adj
  • Whole, not divided into parts. 

  • Of a horse, not tamed. 

  • Continuous, without interruption. 

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