adjective
sallow
SAL-oh/ˈsæləʊ/
Yellowish and unhealthy-looking in complexion.
The man's sallow complexion and tired eyes make him look unwell.

Etymology
Old English salo described something dusky or dark. Applied to the complexion, the meaning narrowed to an unhealthy discoloration, especially a yellowish or pale appearance.
In context
there was nobody else in the house except a sallow looking youth
More examples
- Under the harsh lights, her face looks even sallower.
- His sallow skin contrasts with the bright blue scarf.
- A little blush gives her sallow cheeks some color.
Forms
sallow · sallower · sallowest
sallowness noun — An unhealthy yellowish appearance of skin.