Englishfor English speakers
arduous
—
adjective
(= grueling, gruelling, hard, heavy, laborious, punishing)
characterized by effort to the point of exhaustion; especially physical effort
worked their arduous way up the mining valley
a grueling campaign
hard labor
heavy work
heavy going
spent many laborious hours on the project
set a punishing pace
—
adjective
(= straining, strenuous)
taxing to the utmost; testing powers of endurance
his final, straining burst of speed
a strenuous task
your willingness after these six arduous days to remain here
— F.D.Roosevelt
—
adjective
difficult to accomplish; demanding considerable mental effort and skill
the arduous work of preparing a dictionary
effort
Noun
—
The amount of work that is done on something.
A great amount of effort was put into this event; we had over 4,000 visitors.