Summary
French to English: more detail...
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ardu:
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Wiktionary:
ardu → arduous, difficult, laborious, burdensome -
Synonyms for "ardu":
abrupt; escarpé; raide; rude; difficile; rebutant; rogue; acerbe; rébarbatif; âpre; pénible; laborieux; malaisé; dur; incommode; malcommode; gênant; délicat; compliqué; complexe; confus; périlleux; exigeant; haut; montant; désagréable; savant; instruit; érudit; docte; cultivé; chercheur
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Wiktionary:
French