Something that is difficult is not easy to do, understand, or deal with.
近义词
challenging , complex , demanding , hard
反义词
easy , simple , straightforward , undemanding , uncomplicated
双语例句
例： The lack of childcare provision made it difficult for single mothers to get jobs.
儿童保育服务的缺乏使得单身妈妈们很难找到工作。
例： It was a very difficult decision to make.
这是个非常难作的决定。