nonlinear vs quicksilver

nonlinear

adj
  • Erratic and unpredictable; tending to jump back and forth. 

  • Whose output is not directly proportional to its input. 

  • Having a product of independent variables, or a variable with an exponent not equal to one. 

  • Not lying on a straight line. 

  • Whose atoms do not lie in a straight line. 

quicksilver

adj
  • Unpredictable, erratic or fickle; mercurial. 

noun
  • The metal mercury. 

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

verb
  • To overlay with quicksilver. 

  • To treat with quicksilver. 

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