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Adverb: gruelingly  groo-u-ling-lee
Usage: US (elsewhere: gruellingly)
  1. In an arduous manner
    "they worked gruelingly";
    - arduously, toilsomely, gruellingly [Brit, Cdn]

Nearest

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