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the dimness of sth
dimness 多作不可数名词，与 of 连用，说明某物光线昏暗、暗淡的状态。
The dimness of the corridor made it hard to find the door.
走廊的昏暗让人很难找到门。
昏暗；阴暗
先理解核心含义，再看它在真实句子里的用法。
昏暗；阴暗
the state of being poorly illuminated
The dimness of the corridor made it hard to find the door.
走廊的昏暗让人很难找到门。
昏暗的状态；暗淡。
The state of being dim.
The dimness of the hallway made it hard to find the light switch.
走廊的昏暗让人很难找到电灯开关。
She adjusted the lamp because the dimness of the room strained her eyes.
她调整了台灯，因为房间的昏暗让她的眼睛很累。
The dimness of the old photograph made the faces impossible to recognize.
旧照片的模糊使得面孔难以辨认。
dimness 多作不可数名词，与 of 连用，说明某物光线昏暗、暗淡的状态。
The dimness of the corridor made it hard to find the door.
走廊的昏暗让人很难找到门。
in the dimness 常作状语，表示处于光线微弱的环境里，后可接 of 短语补充具体环境。
In the dimness of the early morning, the city seemed asleep.
在清晨的昏暗中，这座城市似乎还在沉睡。
dimness of vision 是固定说法，指视力模糊或视觉对比度下降，常见于医学语境。
The patient reported dimness of vision in her left eye.
这位患者说她左眼视力模糊。
Not this
The light is dimness.
Use this
The light is dim.
dimness 是名词，意为“昏暗”，不能放在 be 动词后作表语；描述主语的状态需要用形容词 dim。汉语“暗”是形容词，学习者容易把名词形式误当形容词用。
Not this
The room was in dimness, so I could not see anything.
Use this
The room was in darkness, so I could not see anything.
dimness 指“微暗、光线不足”，并非完全没有光；表示“完全黑暗、无光”应用 darkness。汉语“暗”可对应这两个词，因此容易混用；此处“看不到任何东西”强调完全无光，所以必须用 darkness。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
房间的昏暗
The dimness of the room made it hard to read.
房间的昏暗让人很难看书。
适应昏暗的光线
Her eyes slowly adjusted to the dimness of the cave.
她的眼睛慢慢适应了洞穴里的昏暗。
向昏暗中凝望
He peered into the dimness, trying to find the exit.
他向昏暗中凝望，试图找到出口。
视力模糊
The patient reported sudden dimness of vision in one eye.
病人报告说一只眼睛突然视力模糊。
在昏暗中
A figure appeared in the dimness at the end of the hall.
一个身影出现在大厅尽头的昏暗中。
Use dimness naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 dim 想成“昏暗的灯光”，加上名词后缀 -ness，就变成“昏暗/模糊”的状态。
语域：neutral 常见场景：文学或描写性文本、光学、摄影等技术讨论、视力或视觉感知描述 dimness 是中性偏书面的名词，多用于书面语或较正式的描述，日常口语中更常用 darkness（黑暗）或 poor lighting（光线不足）。具体含义需根据上下文判断：可指光线昏暗、灯光或声音微弱，也可指影像对比度低、不清楚。
词典给出复数形式 dimnesses，可用于指多种昏暗的程度或状态。
Dictionary facts from ECDICT, WIKTIONARY.