interesting vs soporific

interesting

adj
  • Pregnant. 

  • Arousing or holding the attention or interest of someone. 

soporific

adj
  • Boring, dull. 

  • Tending to induce sleep. 

noun
  • Something boring or dull. 

  • Something inducing sleep, especially a drug. 

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