glib vs smooth operator

glib

noun
  • A mass of matted hair worn down over the eyes, formerly used in Ireland. 

adj
  • Snarky or unserious in a disrespectful way. 

  • Having a ready flow of words but lacking thought or understanding; superficial; shallow. 

  • Artfully persuasive but insincere in nature; smooth-talking, honey-tongued, silver-tongued. 

verb
  • To make smooth or slippery. 

smooth operator

noun
  • A person who accomplishes tasks with efficiency and grace, especially one with verbal skills who is persuasive in interpersonal relationships, negotiation, etc. 

  • A skillful, manipulative person, con artist, or clever scoundrel. 

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