unsettled vs vacillant

unsettled

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

  • Unpaid. 

  • Not populated, having no settlers or other inhabitants. 

  • Disturbed, upset. 

vacillant

adj
  • Vacillating; wavering; fluctuating; irresolute. 

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