precursive vs promising

precursive

adj
  • Preceding; introductory; precursory. 

  • Being a style of handwriting that can later be developed into cursive. 

promising

noun
  • The act of making a promise. 

adj
  • Showing promise, and likely to develop in a desirable fashion. 

  • a promising young apprentice 

  • Encouraging and inspiring confidence. 

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