docile vs erratic

docile

adj
  • Yielding to control or supervision, direction, or management. 

  • Ready to accept instruction or direction; obedient; subservient. 

erratic

noun
  • A rock moved from one location to another, usually by a glacier. 

  • Anything that has erratic characteristics. 

adj
  • Deviating from normal opinions or actions; eccentric; odd. 

  • Unsteady, random; prone to unexpected changes; not consistent. 

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