Sis·y·phe·an /ˌsɪsəˈfiən/ (a.)徒勞的;永遠做不完的
Sis·y·phe·an a. Relating to Sisyphus; incessantly recurring; as, Sisyphean labors. ◄ ►
Sisyphean adj 1: of or relating to Sisyphus 2: both extremely effortful and futile