1. [adj]  not yet having made a commitment; "undecided voters"
2. [adj]  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"
3. [adj]  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"

UNDECIDED is a 9 letter word that starts with U.