From The Collaborative International Dictionary of English v.0.48 [gcide]:
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]
From WordNet (r) 3.0 (2006) [wn]:
grueling
adj 1: 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" [syn: {arduous},
{backbreaking}, {grueling}, {gruelling}, {hard}, {heavy},
{laborious}, {operose}, {punishing}, {toilsome}]
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