impersonal vs straight from the horse’s mouth

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. 

straight from the horse’s mouth

How often have the words impersonal and straight from the horse’s mouth occurred in a corpus of books? (source: Google Ngram Viewer )