boring as beans vs soporific

boring as beans

adj

  • Very boring; devoid of interest. 

soporific

adj

  • Boring, dull. 

  • Tending to induce sleep. 

noun

  • Something boring or dull. 

  • Something inducing sleep, especially a drug. 

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