refractory

Adjective

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

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

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

Noun

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

Related words

• Synonyms: 
  fractious , recalcitrant , stubborn , furnace lining