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From our dictionary:
re•frac•to•ry

(ri-frak'tu-rē),
adj., n., pl. -ries.

—adj.

1. hard or impossible to manage; stubbornly disobedient: a refractory child.
2. resisting ordinary methods of treatment.
3. Obs.difficult to fuse, reduce, or work, as an ore or metal.

—n.
1. a material having the ability to retain its physical shape and chemical identity when subjected to high temperatures.
2. refractories, bricks of various shapes used in lining furnaces.