Spent substances or containers have been used and cannot be used again. Radioactive waste is simply spent fuel. the past tense and past participle of spend
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"