unconfirmed vs unsound

unconfirmed

adj
  • Not finally established, settled or confirmed. 

  • Not having undergone the ritual of confirmation. 

unsound

adj
  • Not good, unreliable. 

  • Not whole, not solid, defective. 

  • Infirm, diseased. 

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