gruelling

详细解释:a. 折磨人的, 使人精疲力尽的
n. 痛打, 惩罚
【法】 痛打, 惩罚

英语解释：

形容词 gruelling:

characterized by toilsome effort to the point of exhaustion; especially physical effort同义词：arduous, backbreaking, grueling, hard, heavy, laborious, operose, punishing, toilsome