I'm up in the air about that.
→아직 결정된것 없어.
〔예문〕
A: So how are you getting to the airport on Friday?
그래 금요일에 공항에 어떻게 갈 거야?
B: I'm up in the air about that.
아직 결정된 것 없어.
A: Are you going to take a taxi or a bus?
택시타고 갈 거야 버스타고 갈 거야?
B: I don't have the slightest idea.
난 잘 모르겠어.
A: Yes. I would take you but I have a lot on my plate on Friday
응. 내가 데려다 주고 싶지만 금요일에 내가 아주 바쁠 것 같아.
B: Oh I understand. That's okay.
알았어. 됐어.
* up in the air: 미결상태다 불확실하다
* (one) does not have the slightest idea: 전혀 모르겠다
* (one) has a lot on (one's) plate: 할 일이 아주 많다 아주 바쁘다