arduous
US /ˈɑːr.dʒu.əs/
UK /ˈɑːr.dʒu.əs/

1.
sukar, berat, melelahkan
involving or requiring strenuous effort; difficult and tiring
:
•
The climb up the mountain was long and arduous.
Pendakian gunung itu panjang dan sukar.
•
Learning a new language can be an arduous process.
Mempelajari bahasa baru boleh menjadi proses yang sukar.