backstair vs smarmy

backstair

adj

  • clandestine, secret or furtive 

noun

  • The backstairs (stairs at the rear of a building). 

smarmy

adj

  • Falsely earnest, smug, ingratiating, or pious. 

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