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unexpected + noun
unexpected 作前置定语修饰名词。
The unexpected delay caused problems.
意外的延误造成了问题。
意外的；出乎意料的
先理解核心含义，再看它在真实句子里的用法。
意外的；出乎意料的
not expected or anticipated
The unexpected delay caused problems.
意外的延误造成了问题。
未预料的,未预见的；意外的
Not expected, anticipated or foreseen.
未预料到的；出乎意料的
not expected or anticipated
The sudden rain was completely unexpected, so we had to take shelter under a tree.
突如其来的雨完全出乎意料，所以我们只好在树下躲雨。
AI contextual example
She received an unexpected gift from her old friend on her birthday.
她生日那天收到了一份来自老朋友的意外礼物。
AI contextual example
His unexpected arrival at the meeting surprised everyone in the room.
他出乎意料地出现在会议上，让房间里所有人都很惊讶。
AI contextual example
unexpected guests
不速之客
WordNet
unexpected 作前置定语修饰名词。
The unexpected delay caused problems.
意外的延误造成了问题。
unexpected 作表语，与 be 动词连用。
His arrival was completely unexpected.
他的到来完全出乎意料。
it 作形式主语，真正主语为 that 从句。
It is unexpected that she would resign.
她竟然辞职，这出乎意料。
Not this
He left unexpected.
Use this
He left unexpectedly.
在英语中，'unexpected' 是形容词，不能直接修饰动词。修饰动词应该用副词形式 'unexpectedly'，表示 '出乎意料地'。
Not this
I was unexpected to meet him there.
Use this
It was unexpected for me to meet him there.
当表达'某人做某事出乎意料'时，主语应该是事件（用 it 形式主语），而不是人。正确结构是 'It is/was unexpected for someone to do something'，或者使用副词 'unexpectedly' 修饰动词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
意外的惊喜
The party was an unexpected surprise for her birthday.
这个派对是她生日的一个意外惊喜。
意外的转折
The story took an unexpected turn at the end.
故事在结尾发生了意外的转折。
不速之客
We had an unexpected guest arrive for dinner.
有位不速之客来吃晚饭。
出乎意料的结果
The experiment produced an unexpected result.
实验产生了出乎意料的结果。
意外开支
The car repair was an unexpected expense this month.
汽车修理是这个月的意外开支。
意外延误
Due to an unexpected delay, we missed the flight.
由于意外延误，我们错过了航班。
意外的事态发展
The resignation of the CEO was an unexpected turn of events.
首席执行官的辞职是一个意外的事态发展。
不速之客
We had an unexpected guest at dinner last night.
昨晚晚餐时来了一位不速之客。
意外之财
Receiving that inheritance was an unexpected windfall.
收到那笔遗产是一笔意外之财。
装袋区出现意外物品。
When the self-checkout machine says 'unexpected item in the bagging area,' it always causes a moment of confusion.
当自助结账机说‘装袋区出现意外物品’时，总会引起一阵困惑。
Use unexpected naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：前缀un-表示“不”，expected是“期待”，合起来就是“不期待的”，即“意外的”。
常见场景：日常对话、新闻报道、书面描述 通常用于描述事情出乎意料，语气中性，比较常见于日常和书面语中。
unexpected 常与 to 或 for 连用表示‘对某人来说出乎意料’。注意，unexpected 本身不是动词，没有被动语态。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.