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gruelling (adj.)
also grueling, "exhausting, punishing," 1852, present-participle adjective from gruel (v.) "to punish," from late 18c. slang get (or have) one's gruel "receive one's punishment," from gruel (n.).
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Definitions of gruelling from WordNet
Dictionary entries near gruelling
grubelsucht
grub-stake
Grub-street
grudge
gruel
gruelling
gruesome
gruff
gruffly
grumble
grump