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unexpectedly + adj/adv
用于修饰形容词或副词，表示程度出乎意料。
The test was unexpectedly difficult.
这次考试出乎意料地难。
意外地；出乎意料地
先理解核心含义，再看它在真实句子里的用法。
意外地；出乎意料地
In a way that was not expected; in an unexpected manner.
The test was unexpectedly difficult.
这次考试出乎意料地难。
出乎意料地。
In an unexpected manner.
意外地
in a way that was not expected
未事先计划地
without advance planning
The weather changed unexpectedly, so we decided to stay home.
天气出乎意料地变了，所以我们决定待在家里。
She unexpectedly ran into an old friend at the airport.
她在机场意外地遇到了一位老朋友。
The test was unexpectedly easy, so I finished quickly.
这次考试出乎意料地容易，所以我很快就做完了。
用于修饰形容词或副词，表示程度出乎意料。
The test was unexpectedly difficult.
这次考试出乎意料地难。
用于修饰动词，表示动作发生出乎意料。
The weather changed unexpectedly.
天气出乎意料地变了。
放在句首，修饰整个句子，表示出乎意料的结果。
Unexpectedly, she agreed to help.
出乎意料地，她同意帮忙了。
Not this
It's an unexpectedly event.
Use this
It's an unexpected event.
unexpectedly是副词，不能直接修饰名词。事件(event)是名词，需用形容词unexpected。
Not this
He came unexpected.
Use this
He came unexpectedly.
修饰动词came需用副词unexpectedly，而不是形容词unexpected。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
意外出现
She unexpectedly appeared at the party last night.
她昨晚意外地出现在派对上。
出乎意料地高
The price of oil rose unexpectedly high this quarter.
本季度油价出乎意料地高。
意外发生
The accident happened unexpectedly, despite all precautions.
尽管采取了所有预防措施，事故还是意外发生了。
相当意外地
Quite unexpectedly, he decided to resign from his post.
相当意外地，他决定辞去职务。
意外死亡
The famous actor died unexpectedly of a heart attack.
那位著名演员因心脏病突发意外死亡。
意外出现
He turned up unexpectedly at the party.
他意外地出现在了派对上。
突然造访
She popped in unexpectedly for a chat.
她突然造访来聊天。
使某人措手不及
The news caught me unexpectedly.
这消息让我措手不及。
Use unexpectedly naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
不 + 预期 + 地 = 不预期地 = 意外地
register: neutral; typical settings: general narration, descriptions of events, or expressing surprise; note_zh: 通常用于描述出乎意料的情况，适用于正式与非正式场合。
常用于修饰动词或整个从句，表示事情发生的方式出乎意料。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.