Emaciated
adjective
very thin especially from disease or hunger or cold
“emaciated bony hands”
Similar: bony, cadaverous, gaunt, haggard, pinched, skeletal
verb
grow weak and thin or waste away physically
“She emaciated during the chemotherapy”
Similar: emaciate
verb
cause to grow thin or weak
“The treatment emaciated him”
Similar: waste, emaciate, macerate