Lacking motivation and energy; very tired; knackered.
Of a battery, empty of charge; discharged.
Lacking in vigour; anemic, feeble.
Of a plant: intentionally grown in the dark.
Of an animal or person: having an ashen or pale appearance; also, haggard or thin; physically weak.
Of a plant or part of a plant: pale and weak because of sunlight deprivation or excessive exposure to sunlight.