One way to hold profoundly: instead of measuring how wide or how loud something is, you measure how far down it goes. A wave can cover the whole beach and still only wet the surface; profoundly is the word for the thing that reached the bottom. That is why it does not fit small everyday facts, and why every use of it — being changed by an experience, thinking about a question, or losing your hearing — is really a statement about depth.
「profoundly」的核心畫面可以想成：它量的不是寬度，也不是音量，而是「往下到了多深」。一道浪可以蓋滿整個沙灘，卻只濕了表面；profoundly 講的是那種一路到底的東西。這也是為什麼它配不上雞毛蒜皮的小事。無論是一段經驗改變了一個人、一個人想得多深，還是聽力損失到哪一級，講的其實都是同一件事：深度。
From the word’s history
Wiktionary records profoundly as Middle English profoundly / profoundely, that is profound plus -ly.
來源資料記載 profoundly 出自中古英語 profoundly、profoundely，也就是 profound 加上 -ly；profound 本身講的就是「深」。
Wiktionary entry for 'profoundly' (kaikki extract, source_ref kaikki:3f6f69a190036ae4:1026452389)
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