arduous
US /ˈɑːr.dʒu.əs/
UK /ˈɑːr.dʒu.əs/
1.
involving or requiring strenuous effort; difficult and tiring
:
•
The climb up the mountain was long and arduous.
•
Learning a new language can be an arduous process.
involving or requiring strenuous effort; difficult and tiring