irresponsible vs satisfactory

irresponsible

noun
  • Someone who is not responsible. 

adj
  • Lacking a sense of responsibility; performed or acting as though without responsibility; negligent. 

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