dark 最普通用词，指缺乏自然光线或人工照明，使某物漆黑无光或光线十分微弱。
dim 指光线不足或视力较差，不能清晰地看见物体。
black 侧重颜色是黑色的，有时也指无光的黑暗。
gloomy 指光线不足或部分光线受阻而出现的阴暗。
obscure 指因光线不充足而使物体灰暗不清，失去光泽或若隐若现。作借喻时指因复杂、深奥或含糊而难于理解。
vague 通常作借喻用，形容抽象事物。
grey 与dark意思相近，但侧重阴暗单调的意味。
参考例句
1. When the music started,someone dimmed the lights. 乐曲开奏时就有人把舞台上的灯光转暗了。
2. Maybe even a dim light can give them much hope for a better life. 也许即使是微光可以使他们更希望有一个更美好的生活。
3. Look to dim horizons, bloodless ones in which you are spirit without form. 注意模糊的地平线，在苍白的地平线上，你是无形的灵魂。
英英解释
v.
1. switch (a car's headlights) from a higher to a lower beam
2. become or make darker
3. become dim or lusterless
4. make dim or lusterless
5. make dim by comparison or conceal
6. become vague or indistinct adj.
1. lacking in light; not bright or harsh
2. lacking clarity or distinctness
3. made dim or less bright
4. offering little or no hope
5. slow to learn or understand; lacking intellectual acuity
