arduous

[In Fr. ardu; Sp., Port., & Ital. arduo; Lat. arduus = (1) steep, lofty, (2) difficult. Cognate with Gr. ὀρθός ( orthos ) = straight, or (applied to height) upright. In Erse ard is a height, and in Sansc. úrdva means raised up or lofty.] 1. Lit .: Steep and lofty; high and precipitous. "High on Parna us top her sons she show'd, And pointed out those arduous paths they trod." Pope. 2. Involving much labour, difficult. "To point them to the arduous paths of fame." Pope: Homer's Ody ey , bk. xi., 302. "He must have been aware that such an enterprise would be in the highest degree arduous and hazardous." -Macaulay: Hist . Eng ., chap. ii. ar-du-oŭs-lý, adv. [Eng. arduous; -ly.] With labour or toil; laboriously, toilsomely. (Webster.)