act of indecorum
indecorum 通常为不可数名词，但可用不定冠词修饰具体事例。
His joke was considered an act of indecorum at the formal dinner.
他的笑话在正式晚宴上被视为一种无礼行为。
不得体；失礼；不礼貌
不合礼节的行为；不雅观的状态。；无礼；非礼；无礼的言行
不合礼节的行为；不雅观的状态。
Indecorous behavior, or the state of being indecorous
His indecorum at the formal dinner embarrassed everyone.
他在正式晚宴上的无礼行为让所有人都感到尴尬。
用法提示：名词，指具体的不当行为。
She was criticized for her indecorum during the solemn ceremony.
她在庄严仪式上的失礼举动受到了批评。
用法提示：名词，指缺乏礼貌的表现。
The committee noted his indecorum in addressing the elders.
委员会注意到他对长辈说话时的无礼。
用法提示：名词，指言语上的失礼。
indecorum 通常为不可数名词，但可用不定冠词修饰具体事例。
His joke was considered an act of indecorum at the formal dinner.
他的笑话在正式晚宴上被视为一种无礼行为。
There was indecorum in the way he addressed the elder.
他与老人说话的方式有失礼数。
with indecorum 为副词性用法。
She behaved with indecorum at the ceremony.
她在典礼上表现得无礼。
grammar · medium
易错句子His behavior at the party was indecorum.
正确表达His behavior at the party was indecorous.
indecorum是名词，不能作表语形容词；应改用其形容词形式indecorous。
grammar · medium
易错句子He showed indecorum to the guests.
正确表达He showed indecorum toward the guests.
名词indecorum后搭配介词toward表示‘对……无礼’，不宜用to。
impropriety指违反道德或社会规范的不当行为，范围较广；indecorum特指缺乏礼貌、不合礼仪的言行。
incivility强调粗鲁、不文明的行为或言语，语气更强；indecorum侧重不得体、不合社交礼仪。
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