mediocre vs satisfactory

mediocre

noun
  • A person of minor significance, accomplishment or acclaim; a common and undistinguished person. 

  • A member of a socioeconomic class between the upper ranks of society and the agricultural workers. 

adj
  • Having no peculiar or outstanding features; not extraordinary, special, exceptional, or great; of medium quality, almost always with a negative connotation. 

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 mediocre and satisfactory occurred in a corpus of books? (source: Google Ngram Viewer )