(a.) Serving to resist.

angular bone cement cemental concrete corneous dense diamondlike dure flat flat-chested fleshless flintlike flinty gangling gangly gaunt gawky granitelike granitic hard hard as nails hardhearted horny iron-hard ironlike lank lanky lapideous lean lean-fleshed lean-looking lithoid lithoidal marble marblelike meager obdurate osseous ossicular ossiferous ossified osteal rawboned resistant resistive rocklike rocky scraggy scrawny skeletal skinny solid spare spidery spindling spindly steellike steely stonelike stony thin-bellied thin-fleshed tough twiggy undersized underweight