gruelling
gruelling(美 grueling)adjective- extremely tiring and demanding
精疲力竭的;折磨人的
a gruelling schedule.
让人疲于应付的日程表。
派生gruellinglyadverb语源- mid 19th cent.: from the verb gruel 'exhaust, punish', from an old phrase get one's gruel 'receive one's punishment'
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