noncommittal vs undecided

noncommittal

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

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

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

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 noncommittal and undecided occurred in a corpus of books? (source: Google Ngram Viewer )