refractory

lining consisting of material with a high melting point; used to line the inside walls of a furnace

not responding to treatment; "a stubborn infection"; "a refractory case of acne"; "stubborn rust stains"

temporarily unresponsive or not fully responsive to nervous or sexual stimuli; "the refractory period of a muscle fiber"

stubbornly resistant to authority or control; "a fractious animal that would not submit to the harness"; "a refractory child"