One way to hold this word: a line that has reached its end, with no way back along it. Fatally never measures how big the blow was. It tells you what the blow settled. A person who is fatally does not recover; a plan that is fatally flawed does not get fixed. Whenever you meet the word, the question it answers is the same one: is this thing still going, or is it over?
可以想成一條線走到了盡頭，而且回不去。fatally 從來不是在量「傷得多大」。它說的是「這件事因此定了」。被 fatally injured 的人救不回來；被 fatally flawed 的計畫補不起來。每次遇到這個字，要問的都是同一句話：這件事還走得下去嗎，還是已經結束了？
From the word’s history
Wiktionary records fatally as fatal plus -ly. The adjective fatal still shows the word fate inside it, and the sense of something settled and unable to be changed runs through both meanings of the adverb.
來源記載 fatally 是 fatal 加上 -ly。fatal 這個字裡還看得到 fate（命運），而「已經定了、改不動」的味道，在副詞的兩個意思裡都還在。
Wiktionary (kaikki extract, entry fatally): From fatal + -ly.
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