Done in a raw, unpolished way — without the smoothing that manners, craft, or gentleness would add. Sometimes that rawness offends; sometimes it just means rough-and-ready.
From the word’s history
From Middle English rudely, from rude + -ly. The adjective rude comes via Old French from Latin rudis "rough, raw, unwrought, unpolished" — used of raw materials and unworked stone long before it was used of bad manners.
由 rude 加 -ly 構成，而 rude 經古法語來自拉丁文 rudis：意思是「粗糙的、未加工的、還沒打磨過的」，最早是拿來形容原料和沒鑿過的石頭，跟禮貌完全無關。知道這一點，這個副詞看似散開的五個用法就串起來了——「沒禮貌」其實只是「未加工」用在人際互動上的那一種；「簡陋地」「健壯地」則保留了拉丁文原本的意思。
Latin rudis via Old French; standard etymology given in Wiktionary and the OED entry for "rude"
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原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
rudelyadv/ˈɹuːdli/
- 1
In a rude manner.
- Accompanying the article was a drawing: a chambermaid gripped the long wooden handle of a warming pan that projected rudely from between a tailcoated gentleman’s legs.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。