unpreventable vs unreconcilable

unpreventable

adj

  • Not preventable. 

noun

  • Something that cannot be prevented. 

unreconcilable

adj

  • Irreconcilable. 

noun

  • A person or thing that cannot be reconciled. 

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