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grueling

[groo-uh-ling, groo-ling] /ˈgru ə lɪŋ, ˈgru lɪŋ/
adjective
1.
exhausting; very tiring; arduously severe:
the grueling Boston marathon.
noun
2.
any trying or exhausting procedure or experience.
Origin of grueling
1850-1855
1850-55; slang gruel punishment (noun), punish (v.) + -ing2, -ing1
Related forms
gruelingly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for grueling

gruelling

/ˈɡruːəlɪŋ/
adjective
1.
severe or tiring: a gruelling interview
noun
2.
(informal) a severe experience, esp punishment
Word Origin
C19: from now obsolete vb gruel to exhaust, punish
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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