bony, cadaverous, emaciated, gaunt, haggard, pinched, skeletal, wasted (adj)

very thin especially from disease or hunger or cold

"emaciated bony hands"; "a nightmare population of gaunt men and skeletal boys"; "eyes were haggard and cavernous"; "small pinched faces"; "kept life in his wasted frame only by grim concentration"

cadaverous, cadaveric (adj)

of or relating to a cadaver or corpse

"we had long anticipated his cadaverous end"

cadaverous (Adjective)

Corpselike; hinting of death; imitating a cadaver