counterfeit vs infirm

counterfeit

verb
  • To falsely produce what appears to be official or valid; to produce a forged copy of. 

  • Of a turn or river card, to invalidate a player's hand by making a better hand on the board. 

noun
  • A non-genuine article; a fake. 

  • One who counterfeits; a counterfeiter. 

adj
  • Inauthentic. 

  • False, especially of money; intended to deceive or carry appearance of being genuine. 

  • Assuming the appearance of something; deceitful; hypocritical. 

infirm

verb
  • To contradict, to provide proof that something is not. 

adj
  • Weak or ill, not in good health. 

  • Irresolute; weak of mind or will. 

  • Frail; unstable; insecure. 

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