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unopened + noun
unopened 常作定语，直接放在名词前，表示“未开封的、未打开的”。
An unopened bottle of wine was on the shelf.
架子上有一瓶未开封的葡萄酒。
未打开的；未开封的
先理解核心含义，再看它在真实句子里的用法。
未打开的；未开封的
not yet opened or unsealed
An unopened bottle of wine was on the shelf.
架子上有一瓶未开封的葡萄酒。
尚未打开；仍然关着。
not yet opened; still closed
The unopened bottle of orange juice sat on the shelf for a week.
那瓶未打开的橙汁在架子上放了一个星期。
The invitation remained unopened on the desk for two weeks.
那份邀请函在桌上放了两个星期，一直没有打开。
I found the package unopened at the front door this morning.
我今天早上在前门发现那个包裹还没有打开。
unopened 常作定语，直接放在名词前，表示“未开封的、未打开的”。
An unopened bottle of wine was on the shelf.
架子上有一瓶未开封的葡萄酒。
作表语时描述主语的状态，表示“处于未开封的状态”。
The box was unopened when we found it.
我们发现盒子时，它是未开封的。
leave sth unopened 表示“让某物保持未开封/未打开的状态”。
She left the email unopened until the morning.
她把邮件留到早上才打开。
Not this
I unopened the box because I didn't want to see what was inside.
Use this
I didn't open the box because I didn't want to see what was inside.
unopened 是形容词，不能用作动词。表示“没有打开某物”时，需要用助动词 did 加 not 加动词原形 open，即 didn't open；若想保留 unopened，应使用 keep/leave it unopened 的结构。
Not this
The letter was unsealed, so I knew it had never been read.
Use this
The letter was unopened, so I knew it had never been read.
unsealed 表示“未密封的”或“封口被启封的”，并不等于“未曾被打开的”；unopened 才表示“未被打开、未启封的”。这里要表达信没有被打开过，应该用 unopened。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
未打开的电子邮件
There is an unopened email in my inbox.
我的收件箱里有一封尚未打开的电子邮件。
未拆封的信
She found an unopened letter on the table.
她在桌上发现了一封未拆封的信。
未开封的包裹
The delivery left an unopened package at the door.
快递员在门口留下了一个未开封的包裹。
未拆封的信封
He handed me an unopened envelope.
他递给我一个未拆封的信封。
未开封的瓶子
That is an unopened bottle of wine from 1999.
那是一瓶1999年的未开封的葡萄酒。
未开启的罐头
An unopened can of soup sat on the shelf.
一个未开启的汤罐头放在架子上。
Use unopened naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想记忆：un- 表示“未”，opened 是“打开的”，合起来就是“未打开的”。想象一封未拆封的信，封口完好如初。
语域：neutral 常见场景：mail、packages、store products 该词为中性形容词，日常口语和书面语都常用，通常用来描述信件、包裹、瓶子等尚未打开或未拆封的东西。
发音说明：'unopened' 的词尾 /əʊpənd/ 与 'opened'（/ˈəʊpənd/）押韵。'happened' /ˈhæpənd/、'ripened' /ˈraɪpənd/、'sharpened' /ˈʃɑːpənd/ 均以 '-pened' 结尾，但重读元音不同，发音并不押韵。
Dictionary facts from ECDICT, WIKTIONARY.