emaciated
Definitions
Abnormally thin or weak, especially because of illness or a lack of food.
Wasted away physically; gaunt.
Examples
After weeks of wandering in the wilderness, the stray dog appeared thin and emaciated.
The historical photographs showed emaciated prisoners who had survived the harsh conditions of the camp.
The illness left him looking frail and emaciated, a shadow of the athlete he once was.