From WordNet (r) 3.0 (2006):
spent
adj 1: depleted of energy, force, or strength; "impossible to
grow tobacco on the exhausted soil"; "the exhausted food
sources"; "exhausted oil wells" [syn: exhausted,
spent] [ant: unexhausted]
2: drained of energy or effectiveness; extremely tired;
completely exhausted; "the day's shopping left her
exhausted"; "he went to bed dog-tired"; "was fagged and
sweaty"; "the trembling of his played out limbs"; "felt
completely washed-out"; "only worn-out horses and cattle";
"you look worn out" [syn: exhausted, dog-tired, fagged,
fatigued, played out, spent, washed-out, worn-
out(a), worn out(p)]