A person or animal that is emaciated is extremely thin and weak because of illness or lack of food. horrific television pictures of emaciated prisoners. extremely thin from lack of food or illness (emaciatus, past participle of emaciare, from macer )
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"