ersatz vs unfaithful

ersatz

adj
  • Made in imitation; artificial, especially of a poor quality. 

noun
  • Something made in imitation; an effigy or substitute. 

unfaithful

adj
  • Negligent or imperfect. 

  • Not keeping good faith; disloyal; not faithful. 

  • Not honest or upright. 

  • Not faithfully rendering the meaning of the source language; incorrect. 

  • Not having religious faith. 

  • Adulterous. 

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