gruelling

Adjective, Noun

gru=el=ling

CIDE DICTIONARY

gruelling, adj.

characterized by toilsome effort; requiring extreme physical or mental effort; as, a grueling campaign. [WordNet 1.5]

gruelling, adj. & n. (US grueling)
--adj. extremely demanding, severe, or tiring.
--n. a harsh or exhausting experience; punishment.

Derivative

gruellingly adv.

Etymology

GRUEL as verb, = exhaust, punish

For further exploring for "gruelling" in Webster Dictionary Online

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