Refractory

Tom bought a refractory telescope.

Tom's refractory period is too long.

Owing to the refractory nature of alumina it is with difficulty that it can be diffused in alkaline silicates, borates, or lead silicates.

A refractory material resists heat.

[…] in most instances attempts to coerce the refractory and disobedient have been the signals of bloody wars, […]

Mr. Weller knocked at the door, and after a pretty long interval—occupied by the party without, in whistling a tune, and by the party within, in persuading a refractory flat candle to allow itself to be lighted […]

For five minutes Pollyanna worked swiftly, deftly, combing a refractory curl into fluffiness, perking up a drooping ruffle at the neck, or shaking a pillow into plumpness so that the head might have a better pose. Meanwhile the sick woman, frowning prodigiously, and openly scoffing at the whole procedure, was, in spite of herself, beginning to tingle with a feeling perilously near to excitement.

And the camels galled, sore-footed, refractory, Lying down in the melting snow.

Pure lime is extremely refractory, but readily fusible if any silex is brought in contact with it; […]

There are also over 1,200 pallet brick wagons used for the conveyance of refractory bricks.