exacting
/ɪɡˈzæktɪŋ/adjective [原级] 严格的;苛求的;吃力的
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。
verb [vt. 及物动词] 逼取;急需(exact 的 ing 形式)
That challenge has proved to be singularly exacting and complex. 事实证明,那个挑战极其艰巨复杂。