A voter etc. who has not yet come to a decision.
"Many undecided voters are waiting until Election Day before casting their ballots."
simple past tense and past participle of undecide
"I couldn't undecide my choice after I had finally made it up."
not brought to a conclusion; subject to further thought
"an open question"
"our position on this bill is still undecided"
"our lawsuit is still undetermined"
characterized by indecision
"some who had been on the fence came out in favor of the plan"
"too many voters still declare they are undecided"
Open and not yet settled or determined.
"With so many job offers on the table, she remains undecided about which career path to choose."