* χλωμός (chlōmós): This is a good general term for pale, often suggesting a sickly pallor.
* ωχρός (ōchrós): This also means pale, but can imply a more greyish or ashen pallor.
* ασπράδινος (asprádinos): This literally means "whitish," and could be used if the paleness is due to a lack of color, resembling white.
The best choice will depend on the specific nuance you want to convey.