(p. pr. & vb. n.) of Debilitate.

arduous burdensome crippling debilitating devitalizing difficult draining enervating enfeebling fatiguesome fatiguing grinding grueling hard harsh heavy killing laborious onerous oppressive overburdensome punishing sapping straining strenuous stressful tiresome tiring toilsome trying tyrannous weakening weariful wearing wearisome wearying weighty