difficult的否定形式为easy。它是一个形容词，意思为“困难的、费力的、难解的、麻烦的”，常常用来修饰需要运用一定的智慧和技巧才能解决的问题，它的比较级为：more difficult，最高级为：the most difficult。
It's difficult for them to get here much before seven.
他们很难在7点以前早早地来到这里。
My boss is making life very difficult for me.
我的老板总是给我找麻烦。
