extremely tiring and difficult, and demanding great effort and determination使人精疲力尽的;艰辛的;让人受不了的
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。