impersonal vs poker face

impersonal

noun
  • An impersonal word or construct. 

adj
  • Lacking warmth or emotion; cold. 

  • Not having a subject, or having a third person pronoun without an antecedent. 

  • Not personal; not representing a person; not having personality. 

poker face

noun
  • Any similar expression used to prevent giving away one's motives, feelings, or situation. 

  • An impassive facial expression cultivated to prevent other players from determining whether one's actions in the game are the result of a quality hand, or of bluffing. 

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