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ardu

/aʁ.dy/ adjective C1
  1. steep (of a near-vertical gradient)
  2. arduous, needing or using up much energy, difficult (figuratively)

Feminine ardue · Masculine plural ardus · Feminine plural ardues

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Dantès se leva, jeta naturellement les yeux sur le point où paraissait se diriger le bateau, et à cent toises devant lui il vit s'élever la roche noire et ardue sur laquelle monte, comme une superfétation du silex, le sombre château d'If.
Le Comte de Monte-Cristo, p. 74 · C1

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Words, meanings, pronunciations and forms from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.