refractory

nouns

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"

refractory, stubborn

is derived from

temporarily unresponsive or not fully responsive to nervous or sexual stimuli

"the refractory period of a muscle fiber"

refractory

is similar to

not responding to some influence or stimulus

stubbornly resistant to authority or control

"a fractious animal that would not submit to the harness"; "a refractory child"

is derived from