arduous
UK /ˈɑː.djʊ.əs/ · US /ˈɑɹ.d͡ʒu.əs/ adjective
- adjective Needing or using up much energy; testing powers of endurance. “The movement towards a peaceful settlement has been a long and arduous political struggle.”
- adjective (obsolete) burning; ardent
- adjective Difficult or exhausting to traverse.
Synonyms
burdensome demanding exhausting fatiguing laborious onerous strenuous strugglesome uphill wearisome backbreaking grueling gruelling hard heavy operose punishing toilsome straining
Etymology
From Latin arduus (“lofty, high, steep, hard to reach, difficult, laborious”), akin to Irish ard (“high”).
Webster’s 1913
- adjective Steep and lofty, in a literal sense; hard to climb.
- adjective Attended with great labor, like the ascending of acclivities; difficult; laborious; as, an arduous employment, task, or enterprise.
Etymology [L. arduus steep, high; akin to Ir. ard high, height.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “arduous”, CC BY-SA 4.0. Details