1. 无礼(或粗鲁)的举动;无礼;失礼
Discourtesy is rude and bad-mannered behaviour.

1. a lack of politeness
a failure to show regard for others
wounding the feelings or others

Synonym: offenseoffenceoffensive activity

2. a manner that is rude and insulting

Synonym: rudeness

3. an expression of lack of respect

Synonym: disrespect