"refractory" in the noun sense
1. furnace lining, refractory
lining consisting of material with a high melting point used to line the inside walls of a furnace
"refractory" in the adjective sense
1. refractory, stubborn
not responding to treatment
"a stubborn infection"
"a refractory case of acne"
"stubborn rust stains"
temporarily unresponsive or not fully responsive to a process or stimulus
"the refractory period of a muscle fiber"
3. fractious, refractory, recalcitrant
stubbornly resistant to authority or control
"a fractious animal that would not submit to the harness"
"a refractory child"
Source: WordNet® (An amazing lexical database of English)
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