1. 筋疲力尽的：grovel卑躬屈膝v | grueling筋疲力尽的 | cruel残酷的a

2. 重罚：gruel 稀粥 | grueling 重罚 | gruesome 可怕的

3. 严罚/严惩：gruel /稀饭/粥/ | grueling /严罚/严惩/ | gruelling /严罚/严惩/

4. 令人筋疲力尽的：prefabricated bungalow 活动平房 | grueling 令人筋疲力尽的 | drench 浸泡

adj

1. characterized by effort to the point of exhaustion
especially physical effort

e.g. worked their arduous way up the mining valley
a grueling campaign
hard labor
heavy work
heavy going
spent many laborious hours on the project
set a punishing pace

Synonym: arduousbackbreakinggruellinghardheavylaboriousoperosepunishingtoilsome