optimistic vs promising

optimistic

adj
  • Expecting the best in all possible ways. 

  • Allowing other processes to perform transactions on the same data at the same time, and checking for conflicts only when changes need to be written back. 

promising

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

  • a promising young apprentice 

  • Encouraging and inspiring confidence. 

noun
  • The act of making a promise. 

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