agnostic vs undecided

agnostic

adj
  • Having no firmly held opinions on an issue or matter of uncertainty. 

  • Doubtful or uncertain about the existence or demonstrability of God or other deity. 

  • Of a software component etc.: unaware or noncommittal regarding the specific nature of the components or input with which it interacts. 

  • Of or relating to agnosticism or its adherents. 

noun
  • A person who holds to a form of agnosticism, especially uncertainty of the existence of a deity. 

undecided

adj
  • Uncommitted, not having reached a decision. 

  • Open and not yet settled or determined. 

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

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