1. Very thin especially from disease, hunger or cold
   "a nightmare population of cadaverous men and skeletal boys";
   - emaciated, gaunt, haggard, pinched, skeletal, wasted
    
2. Of or relating to a cadaver or corpse
   "we had long anticipated his cadaverous end";
   - cadaveric

See also: lean, meager [N. Amer], meagre [Brit, Cdn], thin