Cadaverous
/kəˈdævərəs/
Definition 1 of 2
Pro Tip 1/3Unhealthy Appearance
Use 'cadaverous' to describe someone looking sick or malnourished, giving an impression of poor health. 
He emerged from the deserted house with a cadaverous appearance.
Pro Tip 2/3Not Literally Dead
'Cadaverous' can imply someone looks like a corpse, but it doesn't mean they are actually dead. 
Fasting for a week left her with a cadaverous visage, though she was very much alive.
Pro Tip 3/3Extreme Description
'Cadaverous' is intense; use it for dramatic effect or to stress a very unhealthy state. 
The prolonged famine gave the survivors a particularly cadaverous aspect.