You can picture 'humanly' as a line drawn around what a person is. Inside the line is what a human being can do, feel and judge; outside it is beyond us. Every use of the word points at that line — either by saying something was done in the way a person does it, or by saying it was pushed right up to the edge.
From the word’s history
Formed from human plus the adverb ending -ly. In Middle English it was the same word as today's 'humanely', because 'human' and 'humane' had not yet split apart.
humanly 是 human 加上副詞字尾 -ly 造出來的。資料提到在中古英語裡，它和今天的 humanely 本來是同一個字，因為那時 human 和 humane 還沒分家。後來兩邊才分工：humanly 留下「以人的方式」，humanely 拿走「不讓對方受苦地」。
Wiktionary entry 'humanly' (adv), etymology_text supplied in this packet — source_ref kaikki:3f6f69a190036ae4:1458868835:5204
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