skeletal (adj.)

• attenuated
• bony
• cadaverous
• emaciated
• flat
• gangling
• gangly
• gaunt
• gawky
• haggard
• hollow-eyed
• jejune
• lank
• lanky
• lean
• meager
• peaked
• peaky
• pinched
• poor
• puny
• rawboned
• scraggy
• scrawny
• shriveled
• skinny
• spare
• spidery
• spindly
• starved
• twiggy
• underfed
• undernourished
• undersized
• underweight
• wasted
• withered
• wizened
• wraithlike