/ ˌʌndɪˈsaɪdɪd; NAmE / adjective [ not usually before noun ]
1.
undecided (about sb/sth) | undecided (as to sth) not having made a decision about sb/sth :
I'm still undecided (about) who to vote for.
2.
not having been decided :
The venue for the World Cup remains undecided.
—compare decided