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

Nearest

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