grueling

[groo-uh-ling, groo-ling]
adjective
1.
exhausting; very tiring; arduously severe: the grueling Boston marathon.
noun
2.
any trying or exhausting procedure or experience.
Also, especially British, gruelling.


Origin:
1850–55; slang gruel punishment (noun), punish (v.) + -ing2, -ing1

gruelingly, adverb
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World English Dictionary
gruelling or (US) grueling (ˈɡruːəlɪŋ)
 
adj
1.  severe or tiring: a gruelling interview
 
n
2.  informal a severe experience, esp punishment
 
[C19: from now obsolete vb gruel to exhaust, punish]
 
grueling or (US) grueling
 
adj
 
n
 
[C19: from now obsolete vb gruel to exhaust, punish]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The grueling schedule that many doctors go through to train as specialists is
  about to ease.
They put themselves through grueling marathons of public scrutiny.
Business travel is grueling enough without having to put up with someone you
  don't know well for the entire evening.
Together, in between grueling shifts, they broke fast and prayed for the mud to
  hold.
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