effortful
boresome
boring
burdensome
draining
exhausting
fatiguesome
fatiguing
grinding
grueling
harsh
heavy
irksome
killing
onerous
oppressive
overburdensome
punishing
straining
stressful
stupefyingly boring
stuporific
tiresome
tiring
toilsome
trying
tyrannous
weariful
wearing
wearisome
weighty
yawny