lethargic vs torpedinous

lethargic

adj

  • sluggish, slow 

  • indifferent, apathetic 

torpedinous

adj

  • Exerting a benumbing influence; stupefying; dull; torpid. 

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