gruelling
adjective mainly UK (US usually grueling) uk/ˈɡruː.ə.lɪŋ/ us/ˈɡruː.ə.lɪŋ/
使人精疲力尽的；艰辛的；让人受不了的
extremely tiring and difficult, and demanding great effort and determination
Junior doctors often have to work a gruelling 100-hour week. 资历较浅的医生经常必须承受艰巨的工作量，一周工作100小时。
He eventually won the match after five gruelling sets. 经过5局艰难的拼杀，他终于赢得了比赛。
Synonyms: arduousbackbreakinghard heavy punishing