arduous

Mane (Îngilîzî)

1. Needing or using up much energy; testing powers of endurance.
2. (obsolete) burning; ardent
3. Difficult or exhausting to traverse.

Hevwate

difficult

hard

laborious

heavy

tough

toilsome

exacting

burdensome

challenging

strenuous

grievous

gruelling

operose

troublesome

straining

difficult of access

uphill

tiring

onerous

backbreaking

painful

punishing

formidable

exhausting

inconvenient

troublous

demanding

steep

miserable

painstaking

grueling

stiff

taxing

tiresome

trouble

trying

unfriendly

unpronounceable

unutterable

vexing

wearisome

labourious

heavy going

laboursome

hard-to-reach

difficult to climb

laberious

hard-to-get-to

requiring much labour

burdenous

Werger

ardu

zwaar

arduo

arduo

mühsam

faticoso

ardu

pénible

moeilijk

difficile

ardua

moeizaam

anstrengend

صعب

uitputtend

Wekî (IPA) tê bilêvkirin

/ˈɑː.djuː.əs/

Etîmolojî (Îngilîzî)

From Latin arduus (“lofty, high, steep, hard to reach, difficult, laborious”), akin to Irish ard (“high”).