I'm not very hopeful.是什么意思？

I'm not very hopeful.

我不抱太多希望。

not

adv. 不，[用以表示否定、否认、拒绝、禁止等]不是，几乎不，未必，没有[用于否定后面的词或短语]；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

very

adj. 很，非常，恰好是，正是，十足的，特有的；adv. 很，非常，充分，完全；

例句
Most people have very little difficulty in seeing why a Van Gogh is a work of genius.
多数人不难理解为什么凡·高的作品是天才之作。

hopeful

adj. 抱有希望的，给人以希望的；n. 有成功希望的人；

例句
Mr Norris said he was hopeful that his request would elicit a positive response...
诺里斯先生说希望他的请求能够引起积极反响。