arduous in Russian
arduous in Russian
тру́дный
Needing or using up much energy; testing powers of endurance.
напряжённый
Needing or using up much energy; testing powers of endurance.
тяжёлый
Needing or using up much energy; testing powers of endurance.
круто́й
Difficult or exhausting to traverse.
труднодосту́пный
Difficult or exhausting to traverse.