uitputtend (bn):
agotador(en) so difficult or taxing as to make one exhausted.
(en) Very tiring., arduo(en) needing or using up much energy.
(en) hard to climb or traverse., riguroso(en) hard to climb or traverse.
(en) needing or using up much energy., cansino(en) tiresome., extenuante(en) so difficult or taxing as to make one exhausted., penoso(en) so difficult or taxing as to make one exhausted.
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Via: Memodata.com