Someone who is dangerously skinny and skeletal looking can be described as emaciated. It's probably how you'd start to look after a few weeks in the wilderness with only berries and bugs for dinner.
Adjective S.
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"
imp. & p. p.
of Emaciate
Usage Examples
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