inefficient vs satisfactory

inefficient

noun
  • A person who cannot or does not work efficiently. 

adj
  • Not efficient; not producing the effect intended or desired; inefficacious 

  • Incapable of, or indisposed to, effective action; habitually slack or unproductive; effecting little or nothing 

satisfactory

noun
  • Somebody or something that meets requirements without exceeding them. 

  • The rating given to somebody or something that meets requirements without exceeding them. 

adj
  • Causing satisfaction; agreeable or pleasant; satisfying. 

  • Done to satisfaction; adequate or sufficient. 

  • Making atonement for a sin; expiatory. 

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