What is a synonym for "pallor"?

The term "pallor" refers to an unusual or extreme paleness, often associated with illness, shock, or fear. In this context, "fairness" is a synonym because it can also describe a light skin tone or complexion. Both words convey the idea of a lack of color and a lighter appearance. This connection helps to understand how "fairness" relates to "pallor" in describing skin tones.

The other options do not align with the definition of "pallor." "Cheerfulness" and "brightness" contrast with the notion of pale complexion, while "palpability" relates to something that can be touched or felt, which is unrelated to color or complexion. Thus, "fairness" is the most appropriate synonym for "pallor."