diplomatic vs noncommittal

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. 

noncommittal

adj
  • Tending to avoid commitment; lacking certainty or decisiveness; reluctant to give out information or show one's feelings or opinion. 

noun
  • Failure to commit to a decision or course of action. 

  • A voter etc. who has not yet committed to a decision. 

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