arduous

/ˈɑːdjuːəs/

sifat adjective

Needing or using up much energy; testing powers of endurance. The movement towards a peaceful settlement has been a long and arduous political struggle.
Burning; ardent
Difficult or exhausting to traverse.

Manbalar: Wiktionary (Free Dictionary API orqali), Datamuse, Tatoeba (CC BY 2.0 FR), MyMemory.