rude: implies ignorance or difference to good form or materials: fashioned a ~ structure; OR may suggest intentional discourtesy: consistently ~ behavior toward his in-laws.


rough: is likely to stress lack of polish and gentleness: the ~ manners of a man used to living in the outback.（偏僻地方）


crude: may apply to thought or behavior that is gross, obvious, or primitive or ignorant of what is highly developed and fully civilized: the ~ antics of college students on spring break.


raw: suggests being unprocessed, untested, inexperiencedand unfinished: charged with turning ~ youths into young men.


callow: applies to the immature, and suggests such youthful qualities as naïvete, simplicity and lack of sophistication: the insensitivity of ~youth. (naïvete天真或幼稚)


green: implies inexperience and lack of assurance, esp. in a new or complex situation, and often simplicity and gullibility: test the mettle of ~ recruits. (mettle勇气: 既不怕困苦又有韧劲的勇气，recruit==enlist募兵)


uncouth: implies strangeness in comparison to what is felt to be normal, finished, or excellent whether because crude and clumsy OR because lacking in polish and grace: behavior that was unbearably ~.(polish=grace优雅)


rude: 有意的不礼貌, 建筑粗糙不注意形状材料，rough: 强调不优雅(polish光滑,即优雅)柔和的举止， crude: 明显的粗陋原始，不懂得文明发展，raw: 没有处理验证或完善， callow: 年轻不成熟，如简单幼稚不通世故，green: 缺乏经验没有把握(如被骗)，uncouth粗陋笨拙: 和正常完善优秀言行相比显得奇怪，表示粗陋笨拙或缺乏优雅。

记忆方法： 1） 首字母联想RCRCGU：RUG CCRR，踩着别人家的地毯出出入入==>粗糙原始。  rug:  铺地上的小地毯。


           2） 粗陋的意思是: mean lacking in the qualities that make for finish and perfection in development or use.