adj. Being unenthusiastic or unsure about a decision, particularly when choosing a candidate in an election.
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I'll be honest, though, I'm pretty underwhelmed with this whole election. I know who I'm going to vote for, and I've known for a while, but I wish I could have been more excited about it. I don't fall into the "undecided" category, but I guess I'm looking for a reason to get enthused — for a reason to change my vote.

I've coined a word for this feeling — "underdecided."
—Grant Hamilton, “I would vote in advance, if…,” Brandon Sun, September 26, 2011
In some ways, schools are designed for people who have already made a decision about their major. That can make it uncomfortable for students who either are undecided about their major or have significant reservations about their current choice. If you are undecided or underdecided, realize that you have a great advantage over students "who know for sure" what they want to do.
—John A. Beck & Marmy A. Clason, “Light on the Path,” Wadsworth, September 11, 2007
1992 (earliest)
He can draw some solace from the fact that despite the opinion polls, even media pundits writing "analyses" of why Clinton might defeat Bush, often end up with the small-print caveat that the choice of the large percentage (14 per cent at the last count) of undecided (or under-decided) voters could turn out to be crucial.
—“India Today Volume 17 Issues 13-23,” Living Media India, March 30, 1992
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