unconfirmed vs undetermined

unconfirmed

adj
  • Not finally established, settled or confirmed. 

  • Not having undergone the ritual of confirmation. 

undetermined

adj
  • Not determined; not settled; not decided. 

  • Not limited; not defined; indeterminate. 

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