grueling

gru·el·ing also gru·el·ling  (gr-lng, grlng)

adj.

Physically or mentally demanding to the point of exhaustion: a grueling campaign.

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gruel·ing·ly adv.

Thesaurus

Adj.

1.

grueling - characterized by effort to the point of exhaustion; especially physical effort; "worked their arduous way up the mining valley"; "a grueling campaign"; "hard labor"; "heavy work"; "heavy going"; "spent many laborious hours on the project"; "set a punishing pace" arduous, backbreaking, gruelling, laborious, operose, toilsome, punishing, hard, heavy effortful - requiring great physical effort