英汉词典

1. 不确定的；迟疑的；无把握的
    If you are uncertain about something, you do not know what you should do, what is going to happen, or what the truth is about something.

    e.g. He was uncertain about his brother's intentions...
           他拿不准他哥哥的意图是什么。
    e.g. They were uncertain of the total value of the transaction...
           他们还不确定这笔交易的总价值是多少。