adj. 困难的；难做的；难解的；不易相处的
difficult 困难的
dis-, 不，非。facile, 简单的，好做的，词源同fact, efficient. 即不好做的，困难的。
1、a glorious yet difficult task 一项光荣而艰巨的任务
2、a yet more difficult task 更困难的工作
3、be difficult of 难以,不易…
4、be difficult of approach 难以接近
5、difficult dentition [医] 出牙困难
6、difficult labor [医] 难产
7、difficult menstruation [医] 月经困难
8、have a difficult time doing sth 做某事有困难
9、it is difficult to do 难以(做)..., 很难(做)...
10、tide over a difficult patch 度过难关
11、difficult index 困难指数
12、more difficult 更难的（difficult的比较级）
13、the most difficult 最困难的
14、difficult inmate 难缠的囚犯
15、difficult lambing 很难的羔羊
16、difficult situation 困厄
17、difficult foundation 困难的基础
18、difficult swallowing 吞咽困难
19、difficult temperament 难相处的气质