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If someone is crass, they behave in a stupid and offensive way that shows they do not understand other people's feelings — or do not care. It is not only “rude.” Rude can be short or sharp. Crass is thicker than that: loud, , and tasteless, as if the person cannot see why a joke, a comment, or a money-grab might hurt.
If someone is crass如果一個人crass（沒品、粗魯無禮），they behave in a stupid and offensive way表示他們的行為既愚蠢又冒犯人，that shows they do not understand other people's feelings顯示他們不懂別人的感受——or do not care或是根本不在乎。It它is not only "rude"不只是「rude（沒禮貌）」而已。Rude rudecan be short or sharp可能只是話說得比較簡短或尖銳。Crass而crassis thicker than that比那更嚴重：loud, clumsy, and tasteless是那種張揚、笨拙又沒品味的樣子，as if the person cannot see why a joke, a comment, or a money-grab might hurt好像完全看不出一個玩笑、一句話，或一個撈錢的舉動為什麼會傷人。
A crass remark at a funeral. Crass jokes about someone's body. Crass advertising that uses a sad story only to sell.
A crass remark at a funeral像是在喪禮上說出沒品的話。Crass jokes about someone's body拿別人的身材開沒品的玩笑。Crass advertising that uses a sad story only to sell或是用悲傷的故事沒品地拿來賣東西的廣告。
The word is rather formal and a little old-fashioned in everyday chat; younger speakers might just say rude, gross, or out of line. In writing, and when you want to sound rather than merely angry, crass still does useful work.
The word這個字is rather formal and a little old-fashioned in everyday chat在日常對話裡算是有點正式、也有點過時；younger speakers年輕人might just say rude, gross, or out of line可能就直接說rude、gross，或out of line。In writing在寫作裡，and when you want to sound unimpressed rather than merely angry還有想表現出不以為然而不只是生氣的時候，crass crassstill does useful work仍然很好用。
It judges the person's taste and their lack of care, not only the surface of the words. You can call an action crass, a comment crass, or a person crass.
It它judges the person's taste and their lack of care批評的是一個人的品味和不在乎的態度，not only the surface of the words而不只是表面上說的話。You你can call an action crass, a comment crass, or a person crass可以說一個行為crass、一句話crass，或一個人crass。
組成From Middle English cras, from Old French cras, from Latin crassus, “dense, thick, fat, heavy.” The English sense moved from “thick” to “coarse,” then to “insensitive.” Doublet of grease — they come from the same Latin word, though nobody feels the link now.
原始詞典資料4 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。
crassadj/kɹæs/
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Coarse; crude; unrefined or insensitive; lacking discrimination or taste.
- You guys would rather be with someone else who’s equal to your status in life. Tiger Woods, or somebody. I comes across as crass, a Neanderthal, a babbling idiot sometimes. I like to show you that person. I like that person.
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Materialistic.
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Physically dense or thick.
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Lacking finesse; crude and obvious.
- 8. They require that crass stupidities shall not be played upon the reader as “the craft of the woodsman, the delicate art of the forest,” by either the author or the people in the tale.
- One may very easily fall into mistakes and errors when one is searching into the hidden causes of things, in the absence of real experiments, and this is easily apparent from the crass error of Cardan; who deems himself to have discovered the distances of the centres of the cosmos and of the earth through a variation of the magnetick iron of 9 degrees.
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。