形容詞 grueling:

1. characterized by toilsome effort to the point of exhaustion; especially physical effort
   同義詞：arduous, backbreaking, gruelling, hard, heavy, laborious, operose, punishing, toilsome

1. My parents like eating gruel.
   我父母喜歡吃稀粥。
2. Gruel is convenient to make in the morning for breakfast.
   吃早飯時，做稀粥是很方便的。

grueling 也作 gru.el.ling

adj.（形容詞）
Physically or mentally demanding to the point of exhaustion:
折磨的，使精疲力盡的：對生理或心理上的要求達到極限的：
例句：
a grueling campaign.
令人精疲力盡的比賽

【引伸】
gru.elingly
adv.（副詞）