complimentary vs satisfactory

complimentary

adj
  • In the nature of a compliment. 

  • With respect to the closing of a letter, formal and professional. 

  • Free; provided at no charge. 

satisfactory

adj
  • Causing satisfaction; agreeable or pleasant; satisfying. 

  • Done to satisfaction; adequate or sufficient. 

  • Making atonement for a sin; expiatory. 

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

  • Somebody or something that meets requirements without exceeding them. 

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