1
be unprepared for sth
for 后接事件或情况，表示“对……没有准备”。
Many students were unprepared for the sudden exam.
许多学生对突如其来的考试毫无准备。
无准备的；未准备好的
先理解核心含义，再看它在真实句子里的用法。
无准备的；未准备好的
without preparation; not prepared for
Many students were unprepared for the sudden exam.
许多学生对突如其来的考试毫无准备。
未准备好的；措手不及的
Not prepared; caught by surprise.
I was unprepared for the pop quiz because I hadn't reviewed the chapter.
我因为没有复习那一章，所以对突击测验毫无准备。
An unprepared hiker can get into trouble when the weather changes quickly.
毫无准备的徒步旅行者在天气骤变时可能会遇到麻烦。
She showed up unprepared for the meeting and forgot to bring the report.
她来开会时毫无准备，还忘了带报告。
for 后接事件或情况，表示“对……没有准备”。
Many students were unprepared for the sudden exam.
许多学生对突如其来的考试毫无准备。
to 后接动词原形，表示“没有准备好做某事”或“不愿做某事”。
She was unprepared to give a speech at the meeting.
她没有准备好要在会议上发言。
常用被动结构 be caught unprepared，强调因突发情况而毫无准备。
The heavy rain caught us unprepared.
这场大雨让我们措手不及。
Not this
She was unprepared the interview.
Use this
She was unprepared for the interview.
unprepared 是形容词，表示“对某事没有准备”时后面必须接介词 for，不能直接跟名词。
Not this
I unprepared for my presentation.
Use this
I was unprepared for my presentation.
unprepared 是形容词而不是动词，作谓语时必须与 be 连用，不能说 unprepared for。
Not this
He is unprepared of the exam.
Use this
He is unprepared for the exam.
受中文“对考试没有准备”的影响，容易误用 of；英语中用 for 引出未准备的对象。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
对…毫无准备
She was unprepared for the sudden change in plans.
她对计划的突然变化毫无准备。
被打了个措手不及
The storm caught everyone unprepared.
暴风雨让所有人都措手不及。
完全没有准备
He was completely unprepared for the interview.
他对面试完全没有准备。
即席讲话
The chairman gave an unprepared speech at the dinner.
主席在晚宴上作了即席讲话。
措手不及；毫无准备
Investors were caught unprepared by the sudden market crash.
投资者被突如其来的市场崩盘弄得措手不及。
Use unprepared naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：prepared 是“准备好”，前面加 un- 就是“没准备好”——想象上台前才发现稿子没带，慌慌张张 unprepared。
语域：neutral 常见场景：考前或面试前的讨论、新闻或正式报告、日常对话 通常用于描述某人或某组织没有做好准备的状态，语气比较中性；在日常口语和书面语中都能见到，具体正式程度常取决于搭配和语境（如 be unprepared for...）。
unprepared 是形容词，没有复数形式；不要使用 unprepareds 这一形式。
Dictionary facts from ECDICT, WIKTIONARY.