reliable vs satisfactory

reliable

noun
  • Something or someone reliable or dependable 

adj
  • Suitable or fit to be relied on; worthy of dependence, reliance or trust; dependable, trustworthy 

  • Such that either a sent packet will reach its destination, even if it requires retransmission, or the sender will be told that it didn't 

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