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indecorous: suggests a violation of accepted standard of good manners: your ~ manners marred the wedding reception.
improper: applies to a broader range of transgressions of rules of not only social behavior BUT of ethical practice, or logic procedure, or prescribed method: the ~ use of campaign contributions. (transgress泛指任何违反越界, 有道德意涵，repeated finacial transgressions再三经济不轨)
unseemly: adds a suggestion of special inappropriateness to a situation or an offensiveness to good taste: remarried again with ~ haste.
indecent: implies great unseemliness or gross offensiveness especially in referring to sexual matters: a scene judged ~by the censors.
unbecoming: suggests behavior or language felt to be beneath or unsuited to one's character or status: conduct ~ an officer.
indelicate: implies a lack of modesty, or of tact, or of refined perception of feelings: ~ expressions for bodily functions.
indecorous不合礼仪: 就是不礼貌的，improper不当: 范围更广，除了社交方面还可用于伦理流程方法等，unseemly不得体: 不合时宜(inappropriate to situation)违反品味(offensiveness to good taste)，indecent下流: 非常不得体粗暴冒犯，特别指性，unbecoming不当失品: 言行有失品格地位(beneath介词低于)，还表示不好看(unbecoming dress难看的衣服 )，indelicate粗俗不雅: 不谦虚不圆通不敏感(tact圆通老练，本身是词根表示触摸，比喻人际交往时需要象手指一样敏感，避免冒犯别人)
记忆方法：1）首字母iiuiui我我你我你我==>我多你少<==有些不恰当
2）不当的意思是不正确不适当没品味mean not conforming to what is accepted as right, fitting, or in good taste.
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