refractory
adj.
"stubborn, obstinate, perverse," 1610s (earlier refractorious, 1550s, refractary, c.1600), from Latin refractarius "obstinate, stubborn," from past participle stem of refringere (see refraction). Related: Refractorily; refractoriness.
〔李〕[re-=against反抗；fract=to break破；-ory a.=having the quality有……性能的→“having the quality against breaking抗破碎的”→] a. ① resistant to treatment 耐处理的