Definition Of undecided
(of a person) not having made a decision.
the jury remained undecided
a person who has not decided how they are going to vote in an election.
However, my observation is that, in presidential elections, the undecideds tend to vote against major change.
Example Of undecided
A lot of people are undecided about whether that's good or bad.
Although I'm generally undecided about legalizing gambling, I strongly support legalizing poker, e.g. California.
But have some of these arguments been left undecided by the Full Court?
But historically, many undecided voters make their decision during the past month or even the last few days of an election season.
But I guess there are some really undecided people.