He was deadly pale and terribly emaciated, with the protruding, brilliant eyes of a man whose spirit was greater than his strength.
emaciated
/i-ˈmā-shē-ˌā-təd/
adjective
very thin and feeble especially from lack of nutrition or illness
verb
to cause to lose flesh so as to become very thin
to make feeble
to waste away physically
cattle emaciated by illness