decorum
noun /dɪˈkɔːrəm/
  /dɪˈkɔːrəm/
[uncountable] (formal)- polite behaviour that is appropriate in a social situation礼貌得体;端庄稳重 - He is not known for his sense of decorum.他并不以高雅著称。 
- The celebrations were carried off with style and decorum.庆祝活动以高雅的方式进行。 
 词源mid 16th cent. (as a literary term, denoting suitability of style): from Latin, neuter of the adjective decorus ‘seemly’.
- He is not known for his sense of decorum.