verb

1. To reverse or recant (a previous decision).

noun

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

adjective

1. Open and not yet settled or determined.

   “The question of man's destiny is still undecided.”

2. Uncommitted, not having reached a decision.

   “The result of the election is in doubt because of a large number of undecided voters.”

Synonyms: indecisive, indeterminate, unsettled, ambivalent, indecisive, irresolute, of two minds