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be unmarked
be unmarked 表示某物没有标识或标记。
The grave was unmarked for more than a century.
这座坟墓一百多年来都没有标记。
无记号的；无标志的
先理解核心含义，再看它在真实句子里的用法。
无记号的；无标志的
not having an identifying mark
The grave was unmarked for more than a century.
这座坟墓一百多年来都没有标记。
无标识的,无识别标记的。
Not bearing identification.
无瑕疵的,没有污点的。
Free from blemishes.
未被注意的,不被人察觉的。
Not noticed.
无人盯防的。
Not closely followed by a defensive player.
The package arrived in an unmarked envelope, so no one knew who sent it.
包裹装在没有标记的信封里寄到了，所以没人知道是谁寄的。
Many graves in the old cemetery are unmarked, so it is hard to find a specific ancestor.
那座老墓园里许多坟墓没有碑文标记，因此很难找到某位先人的墓。
She chose an unmarked path through the forest to avoid the crowds.
她选择了一条没有路标的小路穿过森林，以避开人群。
be unmarked 表示某物没有标识或标记。
The grave was unmarked for more than a century.
这座坟墓一百多年来都没有标记。
leave + 宾语 + unmarked 表示使某物保持没有记号的状态。
Please leave the questionnaire unmarked if you do not want to participate.
如果你不想参加，请勿在问卷上做任何标记。
unmarked by 后接名词，表示没有留下某事物的痕迹。
Her skin was unmarked by the years.
她的脸上没有留下岁月的痕迹。
Not this
The teacher unmarked my essay because it was late.
Use this
The teacher did not mark my essay because it was late.
unmarked 是形容词，不能作谓语动词。表示“没有批改”要用否定动词 did not mark。
Not this
This box unmarked.
Use this
This box is unmarked.
形容词作表语时必须与系动词 is 连用；中文的“没有标记”不能直接套用成英语形容词短语，需用 be unmarked。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
无标志警车
The driver did not slow down for the unmarked police car behind him.
司机没有为后面那辆无标志警车减速。
无标记的坟墓
The soldier's remains were placed in an unmarked grave.
这名士兵的遗骸被安放在一座无标记的坟墓中。
无标记包裹
A customs officer noticed an unmarked package on the bench.
一名海关官员注意到长凳上有一个无标记包裹。
无标记小径
We took an unmarked trail through the forest.
我们沿着一条无标记的小路穿过森林。
保持无标记
The ballot papers remain unmarked after the recount.
重新计票后，这些选票仍然没有标记。
未受注意；被忽视
Her excellent work went unmarked by the manager.
她的出色工作没有引起经理的注意。
Use unmarked naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
un-（不）+ marked（有记号的）→ 无记号的，就像没有标签的商品一样不惹人注意。
语域：neutral 常见场景：police vehicles、graves and cemeteries、packages and parcels 该词作“无记号的”解时，通常用于中性或正式语境，多与警方车辆、坟墓、包裹等具体名词搭配；日常口语中也可出现，但更常见于书面或说明性文字。
All listed words rhyme with unmarked: the stressed syllable contains /ɑːk/ followed by /t/ (e.g., /mɑːkt/, /pɑːkt/, /spɑːkt/). For two-syllable words, the stress falls on the final syllable (/ɪmˈbɑːkt/, /rɪˈmɑːkt/), so the rhyme is exact. Beware lookalikes such as 'unmasked' /ʌnˈmɑːskt/ and 'unasked' /ʌnˈɑːskt/: the extra /s/ before /t/ changes the sound, so they are not rhymes.
Dictionary facts from ECDICT, WIKTIONARY.