dissimulate vs feign

dissimulate

verb
  • To practise deception by concealment or omission, or by feigning a false appearance. 

  • To connive at; to wink at; to pretend not to notice. 

  • To disguise or hide by adopting a false appearance. 

feign

verb
  • To make a false show or pretence of; to counterfeit or simulate. 

  • To hide or conceal. 

  • To make an action as if doing one thing, but actually doing another, for example to trick an opponent; to feint. 

  • To imagine; to invent; to pretend to do something. 

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