Bible Dictionaries
Arduous

Webster's Dictionary

(1):

(a.) Attended with great labor, like the ascending of acclivities; difficult; laborious; as, an arduous employment, task, or enterprise.

(2):

(a.) Steep and lofty, in a literal sense; hard to climb.

Bibliography Information
Webster, Noah. Entry for 'Arduous'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​a/arduous.html. 1828.