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gruelling
gruelling (US USUALLY grueling) /ˈɡruː.ə.lɪŋ/ adjective
► F0 extremely tiring and difficult, and demanding great effort and determination: » Junior doctors often have to work a gruelling 100-hour week.» He eventually won the match after five gruelling sets.Thesaurus+: ↑Complicated and difficult to do , ↑Difficult to understandgruellingly (US gruelingly) /-li/ adverb
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