diplomatic vs oily

diplomatic

adj
  • Exhibiting diplomacy; exercising tact or courtesy; using discussion to avoid hard feelings, fights or arguments. 

  • describing a publication of a text which follows a single basic manuscript, but with variants in other manuscripts noted in the critical apparatus 

  • Concerning the relationships between the governments of countries. 

  • Relating to diplomatics, or the study of old texts; paleographic. 

noun
  • The science of diplomas, or the art of deciphering ancient writings and determining their age, authenticity, etc.; paleography. 

oily

adj
  • Excessively friendly or polite but insincere. 

  • Covered with or containing oil. 

  • Relating to or resembling oil. 

noun
  • A marble with an oily lustre. 

  • Oilskins. (waterproof garment) 

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