Undetermined
Part of speech: adjective
Definition: Not determined; not settled; not decided. Not limited; not defined; indeterminate.
Undecided
Part of speech: adjective
Definition: Open and not yet settled or determined.Uncommitted, not having reached a decision.
Example sentence: Close elections tend to break toward the challenger because undecided voters - having held out so long against the incumbent - are by nature looking for change.