粗糙、未加工（字面的粗）
這一支最貼近字根本義：東西做得簡單、粗略、沒下什麼工夫，還停在粗胚的狀態。
crude, roughly made · adjective · B1
Made in a simple, basic way, without much care or skill; rough and plain.
簡陋的；粗製的
核心畫面
Picture something rough, raw, and unfinished — not smoothed, not polished, left in its crude natural state. Most uses of 'rude' come from taking that 'unsmoothed roughness' and applying it to manners, taste, shocks, or health.
可以想成一種粗糙、生的、沒做完的樣子——沒磨平、沒打磨、還停在毛毛糙糙的原始狀態。rude 大部分的用法，都是把這種…更多收起
可以想成一種粗糙、生的、沒做完的樣子——沒磨平、沒打磨、還停在毛毛糙糙的原始狀態。rude 大部分的用法，都是把這種「沒被磨光的粗」搬到不同地方：搬到言行上、搬到玩笑上、搬到打擊上、搬到身體上。From the word’s history
English 'rude' comes from Latin 'rudis', meaning 'rough, raw, unwrought, untilled' — the same root sense of something crude and unfinished still sits at the centre of the modern word.
rude 來自拉丁文 rudis，本義是「粗糙、生的、未加工、未開墾的」。這個「粗而未經打磨」的根義，正好就是今天各種用法的共同核心——無論是舉止還是做工，底層都是這股「沒磨過的粗」。
etymonline.com — rude (from Latin rudis 'rough, raw, unwrought')
Three branches
沒磨過的舉止（無禮、粗俗）
把「粗糙、沒打磨」搬到人的言行與品味上：一個人的態度或玩笑沒經過教養的磨光，於是顯得沒禮貌、上不了檯面。
impolite · adjective · B1
Speaking or behaving in a way that is not polite and can upset or annoy other people.
沒禮貌的；粗魯的
未經緩衝的猛與強
還是那股「沒被磨柔、沒經修飾」的粗，只是這裡表現成一種直接的力道——來得又猛又硬，或壯得結結實實。
rude awakening / rude shock · adjective · B1
A 'rude awakening' or 'rude shock' is a sudden, unpleasant surprise when you learn the truth about something.
猛然醒悟；當頭一棒
原始詞典資料9 筆記錄
以下是外部詞典記錄的用法，原文照列，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。
rudeadj/ɹuːd/
- 1
Lacking in refinement or civility; bad-mannered; discourteous.
- This girl was so rude towards the cashier by screaming at him for no apparent reason.
- Karen broke up with Fred because he was often rude to her.
- 2
Lacking refinement or skill; untaught; ignorant; raw.
- But though I be rude in speech, yet not in knowledge
- Though not as shee with Bow and Quiver armd, But with such Gardning Tools as Are yet rude, Guiltless of fire had formd, or Angels brought […]
- 3
Violent; abrupt; turbulent.
- a rude awakening
- The Air attrite to Fire, as late the Clouds Justling or pusht with Winds rude in thir shock
- 4
Somewhat obscene, pornographic, offensive.
- a rude film
- rude language
- 5
Undeveloped, unskilled, inelegant.
- 6
Hearty, vigorous; found particularly in the phrase rude health.
- A comfortable house for a rude and hardy race, that lived mostly out of doors, was once made here almost entirely of such materials as Nature furnished ready to their hands.
- 7
Crudely made; primitive.
- For a while, purple-robed, heel-dangling, I sat on the edge of one of the rude tables, under the wooshing pines.
- 8
slangGood, awesome.
另外 1 個記錄的用法
- 9
slangSexy, hot, overtly attractive.
- Now the girl's rude, I know she's rude/But she's screwed right through you, you'll be on your knees soon
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。