“difficult”是英语中表示“困难的”的形容词。它来源于拉丁语的“difficips”，其本意是“不易的”。
例句：
The math problem was difficult. (这道数学题很难。)
It's difficult to learn a new language. (学习一种新语言是困难的。)
The hike was difficult, but the view was worth it. (爬山很困难，但景观很值得。)
总之，difficult表示难以完成或理解的，常用来形容任务、学习、生活等方面的困难。