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English definition of “gruelling”

gruelling

adjective uk (US usually grueling)   /ˈɡruː.ə.lɪŋ/ us  
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.Complicated and difficult to doDifficult to understand
gruellingly
adverb uk (US gruelingly)   /-li/ us  
(Definition of gruelling from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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