refractory

Noun
  1. Lining consisting of material with a high melting point;
    Used to line the inside walls of a furnace (synset 103409810)
    is a type of: liner, lining - a protective covering that protects an inside surface
    substance holonym:
    same as: furnace lining
Adjective
  1. Not responding to treatment (synset 302461635)
    "a stubborn infection"; "a refractory case of acne"; "stubborn rust stains"
    similar to: intractable - not tractable; difficult to manage or mold
    same as: stubborn
  2. Temporarily unresponsive or not fully responsive to a process or stimulus (synset 302007041)
    "the refractory period of a muscle fiber"
    similar to: unresponsive - not responding to some influence or stimulus
  3. Stubbornly resistant to authority or control (synset 301618681)
    "a fractious animal that would not submit to the harness"; "a refractory child"
    similar to: disobedient - not obeying or complying with commands of those in authority
    same as: fractious, recalcitrant

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