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Adjective: grueling  groo-u-ling
Usage: US (=gruelling)
  1. Characterized by effort to the point of exhaustion; especially physical effort
    "a grueling campaign"
    - arduous, backbreaking, gruelling [Brit, Cdn], hard, heavy, laborious, operose, punishing, toilsome

See also: effortful

Nearest

grub up
grubber
grubbily
grubbiness
grubby
grubstake
grudge
grudging
grudgingly
gruel
grueling
gruelingly
gruelling
gruellingly
gruesome
gruesomely
gruesomeness
gruff
gruffly
gruffness
grugru