extenuante (bn):
afmattend(en) so difficult or taxing as to make one exhausted., hard(en) requiring great exertion., uitputtend(en) so difficult or taxing as to make one exhausted., veeleisend(en) requiring great exertion., zwaar(en) requiring great exertion.
Via: Dbnary en WikiWoordenboeken
Via: Memodata.com