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be unclassified
be unclassified 表示“未列入保密级别”，即非机密。
The report is unclassified and can be shared publicly.
这份报告是非保密的，可以公开分享。
非机密的；未列入密级的
先理解核心含义，再看它在真实句子里的用法。
非机密的；未列入密级的
not subject to a security classification
The report is unclassified and can be shared publicly.
这份报告是非保密的，可以公开分享。
用于档案或信息未设定保密等级。
未分类的。
Not classified
The unclassified magazines are in a box under the table.
那些未分类的杂志放在桌子底下的箱子里。
These files remain unclassified until we agree on a simple system.
在我们商定一个简单的系统之前，这些文件仍然未分类。
Let's leave the old photos unclassified for now and sort them later.
我们暂时先把这些旧照片留着不分类，晚点再整理。
be unclassified 表示“未列入保密级别”，即非机密。
The report is unclassified and can be shared publicly.
这份报告是非保密的，可以公开分享。
unclassified 放在名词前时多表示“未分类的、未归类的”。
She keeps her notes in an unclassified folder.
她把笔记放在一个未分类的文件夹里。
Not this
The secret files were unclassified in 2020.
Use this
The secret files were declassified in 2020.
unclassified 表示“不保密的、未列入密级的”，指从开始就不属于机密或目前不保密；如果表示曾属机密、后来被正式解除密级，应用 declassified（解密）。
Not this
They unclassified the books in the library.
Use this
They left the books unclassified in the library.
unclassified 是形容词而非动词，不能直接作谓语。要表达“使…不分类/保持未分类”时，常用 leave + 宾语 + unclassified 这一结构。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
非机密信息
The report contains only unclassified information.
这份报告只包含非机密信息。
非机密文件
He released an unclassified document to the public.
他向公众发布了一份非机密文件。
非机密版本
The committee reviewed an unclassified version of the report.
委员会审阅了这份报告的非机密版本。
未分类物种
The expedition discovered an unclassified species of beetle.
考察队发现了一种未分类的甲虫。
未分类物品
The museum stored the unclassified items in a separate room.
博物馆将未分类的物品存放在另一个房间。
Use unclassified naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：un- 像“不”，classified 是“分类/保密”，东西没归入类别、也没标密级，就似散在桌上的文件。
语域：mixed 常见场景：security classification、general categorization 该词在安全保密领域通常指“非机密的”（如 unclassified documents），在日常分类场景中多指“未分类的”或“不分类的”（如 unclassified files）。具体含义需根据语境判断。
Rhymes with unclassified: classified, declassified, reclassified (same final /æsɪfaɪd/ sound). Lookalikes that sound different: modified, identified, justified — their spelling ends in -ified but the stressed vowel differs.
Dictionary facts from ECDICT, WIKTIONARY.