undecided
adj. 未定的；未决定的；不稳定的
例句
He seemed undecided whether to go or stay.
他似乎还没有决定去留。
《牛津词典》
I'm still undecided (about) who to vote for.
我还拿不定主意投谁的票。
The venue for the World Cup remains undecided.
世界杯的举办地点尚未确定。
