quicksilver vs unsettled

quicksilver

adj
  • Unpredictable, erratic or fickle; mercurial. 

verb
  • To overlay with quicksilver. 

  • To treat with quicksilver. 

noun
  • The metal mercury. 

  • An amalgam of mercury and tin applied to the backs of mirrors, quicksilvering. 

unsettled

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

  • Unpaid. 

  • Not populated, having no settlers or other inhabitants. 

  • Disturbed, upset. 

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