Sallowness is the quality of having a yellowish or pale complexion.
Sallowness is often seen as a sign of being unhealthy or not feeling well.
Examples:
Her sallowness made her look sick.
The doctor was concerned about the sallowness of his patient's skin.
The sallowness of his face worried his friends.
The sallowness of the banana made it look overripe.
The sallowness of the moon made it look mysterious.
The sallowness of the light gave the room a spooky feeling.