rough、coarse、harsh、rude与crude这些形容词均有“粗糙的”之意。
rough : 普通用词，指某物纹理不精细，或表面凹凸不平，不光滑。
- 已经锯成粗糙木板的木材
timber sawn into rough planks
coarse : 指某物质地粗糙低劣或编织、加工等不精细、精巧。也指人的言谈举止粗鲁，不文雅。（延伸阅读：区别辨析vulgar、coarse、crude与gross）
- coarse hands/linen
粗糙的手/粗亚麻布
harsh : 指外表、性质、声音的粗糙、刺耳、刺目，强调使人不愉快的粗糙感。
- 他一字一顿，听上去很生硬。
His voice was harsh as he enunciated each word carefully. - 这位代表黑人青年希望的政治家在艰苦的环境中锻造出了自己的独立性。
The politician who embodied the hopes of black youth forged his independence on the anvil of a harsh environment.
rude : 指加工粗糙、不精细。也指某人的言行举止粗鲁无礼，缺乏修养。
- 她回答他无礼的问题时显示出极大的宽容。
She showed great forbearance in answering his rude questions.
crude : 主要指未经加工处理尚处于自然状态的物质；也可指人的言行粗鲁。
- Progress in artificial intelligence (AI) has made finding the right worker for a discrete task quicker and easier than ever, because modern AI systems can look past crude ratings systems and use a range of signals to determine whether a candidate is a good fit.
人工智能（AI）的进步使得为零星任务找到合适的人选变得前所未有的便捷，因为现代人工智能系统不止步于原始的评分系统，而是使用一系列信号来确定候选人是否适合。
——《经济学人》
