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gruelling
From The Collaborative International Dictionary of English v.0.48:
grueling \grueling\, gruelling \gruelling\adj.
1. characterized by toilsome effort; requiring extreme
physical or mental effort; as, a grueling campaign.
Syn: arduous, backbreaking, back-breaking, exhausting,
gruelling, hard, heavy, laborious, labourious,
punishing, slavish, strenuous, toilsome.
[WordNet 1.5]
