exacting
adj. 严格的；苛求的；吃力的
v. 逼取；急需（exact 的 ing 形式）
例句
He was an exacting man to work for.
他对手下的人要求极为严格。
《牛津词典》
She didn't think that he was well enough to carry out such an exacting task.
她认为他身体不是很好，不能执行如此艰巨的任务。
《柯林斯英汉双解大词典》
That challenge has proved to be singularly exacting and complex.
事实证明，那个挑战极其艰巨复杂。
