rotten          
adjective uk/ˈrɒt.ən/ us/ˈrɑː.tən/
B2 腐烂的;腐朽的;变质的
decayed
  The room smelled of rotten vegetables. 房间里一股蔬菜腐烂的味道。 
  极差的,糟糕透顶的,恶劣的
very bad
  rotten weather 糟糕透顶的天气 
old-fashioned It was rotten of you to leave without saying goodbye. 你竟然不辞而别,也太不像话了。 
 - More examples
 - The lizards live in cool, dark places such as rotten logs.
 - The bins were full of rotten food.
 - The birds feed on insects and rotten meat.
 - The crowd threw stones and rotten eggs at the politician.
 - The gas has a smell like rotten eggs.
 
Idiom   
be rotten to the coreidiom  (某人或组织)腐败透顶
If a person or organization is rotten to the core, they behave in a way that is not honest or moral.
  The whole legal system is rotten to the core. 整个司法界简直就烂透了。