feeling worried about something that you are going to do or that is going to happen

I'm very apprehensive about tomorrow's meeting. 想到明天的会议，我就有些惴惴不安。

I've invited a lot of people to the party, but I'm a little apprehensive that no one will come. 我邀请了很多人来参加聚会，但我有些担心，怕没人会来。