They vary in arduousness: all would be marked "heavy work" in a job specification.
They scarcely shrink from any business on account of its magnitude, its arduousness, or its hazard.
They know the arduousness of life, which is a lesson we must all learn sooner or later.
Though not comparing with the arduousness of field service, our duties were by no means slight.
No one has rightly entered on the office without being deeply impressed by its greatness, arduousness, and responsibility.
The task of the Charming Lass was delightful in its simplicity, but fearful in its arduousness.
This is done by making the hours of labor in different trades to differ according to their arduousness.
I am no Mr. Stanley; and the length, the difficulties, the arduousness of the labour appalled me.
1530s, "hard to accomplish, difficult to do," from Latin arduus "high, steep," also figuratively, "difficult," from PIE root *eredh- "to grow, high" (see ortho-). Literal sense of "high, steep, difficult to climb," attested in English from 1709.