unsettled vs unsure

unsettled

adj
  • Not in a steady condition, uncertain, subject to change. 

  • Unpaid. 

  • Not populated, having no settlers or other inhabitants. 

  • Disturbed, upset. 

unsure

adj
  • unstable or precarious 

  • uncertain 

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