A helpful way to picture rudeness is the state of something left rough — not smoothed, not finished, not polished. A wall of raw stone, a stick cut with two chops, a person who says the thing without wrapping it in soft words. Nothing has been worked over to make it pleasant to meet.
From the word’s history
English rude comes, through Old French, from Latin rudis meaning 'rough, raw, unworked' — used of unworked stone or uncultivated land. The noun rudeness is that adjective plus the Middle English ending -ness, i.e. 'the quality of being rough/unworked'.
rude 經古法文來自拉丁文 rudis，意思是「粗糙的、未經加工的」，原本拿來講沒有切磨過的石頭、沒有開墾的土地。rudeness 就是 rude 加上中古英文的 -ness（表狀態），字面即「粗糙未加工的那個性質」。所以現代英文裡「無禮」其實是這個老意思的一支：一個人的言行沒有經過社交禮節那道打磨，就像石頭沒有磨過。
Wiktionary (rudeness < Middle English rudenesse = rude + -ness; rude < Old French rude < Latin rudis 'rough, raw, unworked')
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原始詞典資料2 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。
rudenessnoun
- 1
The property of being rude.
- His rudeness was inexcusable.
- The rudeness of the cabin gave it a rustic charm but little comfort.
- 2
A rude remark or behaviour.
- I'm sick of his rudenesses.
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。