One way to hold this word: the light in a scene has dropped. Start with what that does to the eyes — colours go deep, edges go soft, and you see the shape of a thing without being sure what it is. Then let the same drop in light move . A sentence you cannot pin down is dim in the same way a room is. A face with the light gone out of it is angry, sad, or about to say something you will not like. And a joke told in that low light still makes you laugh, only now you can see what it is laughing at. Every use of darkly is the same scene with the lamp turned down.
From the word’s history
Wiktionary records darkly as Middle English derkly, that is dark plus -ly, with a parallel Old English form deorclice. So the word never carried anything but dark; the range comes from what English chose to point that darkness at.
維基詞典把 darkly 記成中古英語 derkly，也就是 dark 加上 -ly，古英語還有平行的 deorclīċe。換句話說，這個字本身從頭到尾只有「暗」一個意思；它的用法之所以這麼廣，是因為英文把這份暗指向了不同的東西——顏色、視線、臉色、笑點。
Wiktionary entry for darkly (etymology 1), kaikki:3f6f69a190036ae4:824530323:32671 — "From Middle English derkly, derkely, derkliche, derkeliche; equivalent to dark + -ly. Compare Old English deorclīċe, a parallel formation."
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