暗い
kurai
'I don't know much about that' is 暗い too
The picture No light reaching in, so you cannot see what is inside. 暗い has no light reaching in, so you cannot see; 明るい has light filling it, so you can.
Where the picture shows up in 暗い
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no light in a place
廊下が暗いので、電気をつけます。
rōka ga kurai node, denki o tsukemasu
The corridor is dark, I'll put the light on.
Feeling along the wall for the switch because you can't see your own feet
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light taken out of a colour
面接には暗い色のスーツで行きます。
mensetsu ni wa kurai iro no sūtsu de ikimasu
I'll wear a dark suit to the interview.
Pulling the deep navy suit off the rail rather than the pale one
About clothes it simply means a deep, dark shade.
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no light in a face
今日は顔が暗いですね、大丈夫ですか。
kyō wa kao ga kurai desu ne, daijōbu desu ka
You look down today — are you all right?
A colleague who keeps working without looking up when greeted
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no light down the road ahead
今年の見通しは暗いです。
kotoshi no mitōshi wa kurai desu
This year's outlook is bleak.
The door at the end of the corridor shut, with not a line of light leaking through
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no light reaching a subject
私はパソコンに暗いんです。
watashi wa pasokon ni kurai n desu
I don't know much about computers.
Sitting in front of a settings window with your hand stopped, no idea what to click
〜に暗い = to know little about something — the opposite of 〜に明るい.
All of it in one picture
暗い is one picture: no light reaches in, so you cannot see inside. No light in the corridor and you feel along the wall for the switch; take the light out of a colour and it goes deep and sober. No light in a face and you cannot read the mood, so you ask if everything is all right; no light down the road ahead and the outlook is bleak. Let no light reach into a subject at all, and you are the person who knows nothing about it.