believing vs undecided

believing

noun
  • Belief. 

  • The act or process of having faith, trust, or confidence in. 

undecided

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

adj
  • Uncommitted, not having reached a decision. 

  • Open and not yet settled or determined. 

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