not in accordance with accepted rules or standards, especially of morality or honesty
(尤指道德或诚信方面)不合标准的;不正当的,不得体的,不恰当的
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he was accused of improper behaviour in his business dealings 他被指责在交易中有不正当行为
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it is improper to end a sentence with a preposition .以介词结束句子是不恰当的。
lacking in modesty or decency
不谦虚的;不庄重的,不体面的
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it was thought improper for elderly women to wear bright colours .人们认为老年妇女穿着艳丽有失庄重。
"late Middle English: from French