1. (人)抱有希望的，满怀希望的
    If you are hopeful, you are fairly confident that something that you want to happen will happen.

hopeful的翻译

    e.g. I am hopeful this misunderstanding will be rectified very quickly...
           我相信这个误会将很快得到纠正。
    e.g. Surgeons were hopeful of saving the sight in Sara's left eye.
           外科医生有信心保住萨拉左眼的视力。

2. （征兆、事件等）给人以希望的
    If something such as a sign or event is hopeful, it makes you feel that what you want to happen will happen.

    e.g. The result of the election in is yet another hopeful sign that peace could come to the Middle East.
           已出炉的选举结果再次显示在中东实现和平是有希望的。
    e.g. ...hopeful forecasts that the economy will improve.
           认为经济会改善的鼓舞人心的预测

3. （行动）被寄予希望的
    A hopeful action is one that you do in the hope that you will get what you want to get.

hopeful的翻译

    e.g. We've chartered the aircraft in the hopeful anticipation that the government will allow them to leave.
           我们已经包租了那架飞机，希望政府会对他们放行。

4. 希望获得成功的人
    If you refer to someone as a hopeful, you mean that they are hoping and trying to achieve success in a particular career, election, or competition.

    e.g. His soccer skills continue to be put to good use in his job as football coach to young hopefuls.
           他的球技在他给这些希望成为明日之星的年轻人担任教练的过程中继续发挥出很大作用。