favourable vs promissory

favourable

adj
  • Pleasing, encouraging or approving. 

  • Useful or helpful. 

  • Auspicious or lucky. 

  • Convenient or at a suitable time; opportune. 

noun
  • A favourable person 

promissory

adj
  • Containing or consisting of a promise. 

  • Stipulating the future actions required of the parties to an insurance policy or other business agreement. 

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