Open and not yet settled or determined. / Uncommitted, not having reached a decision.

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

simple past tense and past participle of undecide

plural of undecided

(mathematics, computing theory) Incapable of being algorithmically decided in finite time. For example, a set of strings is undecidable if it is impossible to program a computer (even one with infinite memory) to determine whether or not specified strings are included.

the state of being undecidable.

plural of undecidability

In an undecidable manner.

Third-person singular simple present indicative form of undecide

present participle of undecide