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]
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