verb
to become pale or sickly in appearance; to lose vitality or color
adjective
pale or sickly in appearance
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The plant aetiolated due to lack of sunlight in the room.
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The plant looks all pale and sickly because it's not getting enough sun.
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That plant is totally aetiolated, it needs more light to thrive.
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His enthusiasm aetiolated as the project faced numerous setbacks.