arduous
//ˈɑːr.dʒu.əs//
Adjective
arduousCanonical form
more arduousComparative
most arduousSuperlative
1
Requiring great effort, energy, or exertion; extremely difficult and demanding.
Climbing the mountain was an arduous task that took all day.
2
Steep and difficult to climb or traverse.
The arduous mountain path tested even the most experienced hikers.