1. 无准备的；没有预料的；措手不及的；没防备的
    If you are unprepared for something, you are not ready for it, and you are therefore surprised or at a disadvantage when it happens.

    e.g. I was totally unprepared for the announcement on the next day...
           我对第二天的通告完全没有心理准备。
    e.g. Faculty members complain that their students are unprepared to do college-level work...
           学院的老师们抱怨说他们的学生还很不适应大学的课业。

2. 不乐意的；不情愿的
    If you are unprepared to do something, you are not willing to do it.

    e.g. They are unprepared to accept the real reasons for their domestic and foreign situation...
           他们不愿意接受造成这种国内外形势的真实原因。
    e.g. He was unprepared to co-operate, or indeed to communicate.
           他不愿意合作，甚至拒绝交流。