satisfactory vs serious

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. 

serious

adj
  • Without humor or expression of happiness; grave in manner or disposition 

  • Committed. 

  • Really intending what is said (or planned, etc); in earnest; not jocular or deceiving 

  • Important; weighty; not insignificant 

adv
  • In a serious manner; seriously. 

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