a.

1. 声名狼藉的，臭名昭著的；罪大恶极的
   The infamous traitor was sentenced to death.

   那个罪大恶极的叛徒被判处死刑。

2. 无耻的，不名誉的
   I was shocked by her infamous behavior.

   我对她不名誉的行为大为震惊。

3. 【口】差劲的，蹩脚的

adj.

1. well known for some bad quality or deed:
   an infamous war criminal.
2. morally bad; shocking:
   infamous misconduct.