Qui exige beaucoup d'efforts.
Requiring a lot of hard effort.
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See how the word “ardu” is used in sentences
La montée fut longue et ardue. — The climb was long and arduous.
Un entraînement ardu a fait de lui un nageur solide. — Arduous training turned him into a strong swimmer.
Pourquoi as-tu choisi un itinéraire aussi ardu ? — Why did you choose such an arduous route?
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