boring vs somnific

boring

adj
  • Causing boredom or tiredness; making you to feel tired and impatient. 

  • Capable of penetrating; piercing. 

  • Used, designed to be used, or able to drill holes. 

  • Suffering from boredom; mildly annoyed and restless through having nothing to do. 

noun
  • Fragment thrown up when something is bored or drilled. 

  • A pit or hole which has been bored. 

somnific

adj
  • Causing sleep; somniferous. 

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