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or (especially British) gruelling

[groo-uh-ling, groo-ling] /ˈgru ə lɪŋ, ˈgru lɪŋ/
exhausting; very tiring; arduously severe:
the grueling Boston marathon.
any trying or exhausting procedure or experience.
Origin of grueling
1850-55; slang gruel punishment (noun), punish (v.) + -ing2, -ing1
Related forms
gruelingly, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for grueling
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  • With wild cheers the men responded and buckled down to the grueling task.

    A Virginia Scout Hugh Pendexter
  • Not one day, scarcely one hour had been free of grueling labor.

    The Spell of the White Sturgeon James Arthur Kjelgaard
  • With him to show the way the swamp became merely a hard, grueling mush through boggy lowlands.

    The Yukon Trail William MacLeod Raine
  • It isn't a grueling competition like the 'Open' or even the 'Limit.'

    Lad: A Dog Albert Payson Terhune
  • After a week of grueling practise, the first game of the season came like a holiday.

    Stover at Yale Owen Johnson

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