etiolated

Of a plant or part of a plant: pale and weak because of sunlight deprivation or excessive exposure to sunlight.

Of a plant: intentionally grown in the dark.

(by extension) Of an animal or person: having an ashen or pale appearance; also, haggard or thin; physically weak.

“Birds inhabiting desert regions have an etiolated appearance.”

Lacking in vigour; anemic, feeble.

To make pale through lack of light, especially of a plant.

To make pale and sickly-looking.

To become pale or blanched.