Open and not yet settled or determined.
The question of man's destiny is still undecided.
Uncommitted, not having reached a decision.
The result of the election is in doubt because of a large number of undecided voters.
A voter etc. who has not yet come to a decision.
The real drama came as these two camps fought for undecideds, who literally found themselves in the middle.
simple past and past participle of undecide
From Middle English undecided, equivalent to un- + decided.
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