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Grievous means very serious and causing great pain or suffering — of a wound, a crime, a mistake, a loss. A grievous injury is a terrible one. In British law you will hear grievous bodily harm, meaning really serious injury. The word is formal; friends do not chat with it. Though you can see grief in it, it does not mainly mean sad. A grievous error is a very bad error, not a one. Older writing sometimes used it for things that cause grief, and that older colour is still in there, but the living use is severe. Say it GREEV-uhs, not with a hard middle.
極嚴重的、慘重的（偏書面；英國法律有 grievous bodily harm，指重傷）
組成From Middle English grevous, from Anglo-Norman grevous, from Old French grever, from Latin gravō (“to burden”). Developed in the 13th century. Equivalent to grief + -ous.
原始詞典資料2 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。
grievousadj/ˈɡɹiː.vəs/
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Causing grief, pain, or sorrow.
- No wonder that the old man's eye dwelt upon her with mingled pride and tenderness; yet was it a face that might cause affection many an anxious hour, for there was mind in the lofty and clear forehead, heart in the warm and flushed cheek,—and what are mind and heart to woman, but fairy gifts, for whose possession a grievous price will be exacted.
- Heavy rain had so undermined the approach to the bridge at Mountnessing as to make it unsafe, and although Chelmsford and Colchester had decked themselves with flags and bunting, the train returned to London "with grievous disappointment to all."
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Serious, grave, dire, or dangerous.
- As for the captain, his wounds were grievous indeed, but not dangerous.
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。