sleepy vs vigorous

sleepy

adj
  • Suggesting tiredness. 

  • Quiet; without bustle or activity. 

  • Tending to induce sleep. 

  • Tired; feeling the need for sleep. 

  • Dull; lazy. 

noun
  • The gum that builds up in the eye; sleep, gound. 

vigorous

adj
  • Mentally strong and active. 

  • Rapid of growth. 

  • Physically strong and active. 

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