Synonyms for adamantine

He yielded not; adamantine to the seductive lure, he picked up his heels and ran.

And what a triumph for a thief to capture an adamantine heart!

Its strength we feel, its adamantine fidelity to the House of Ulysses.

To polish diamonds they make use of the powder of adamantine spar, or the corundum stone.

"Much better for him to sleep than to say good-by," said this adamantine woman.

But one of the chaplains had adamantine ideas on theological subjects.

Has man an adamantine frame, that he should outlast the trees of the field?

Why are we bound, by the habits of society, as with an adamantine chain?

God's beneficent sovereignty was to him the adamantine foundation of the Gospel.

His distress would have moved an adamantine heart, and was not a thing to cavil at.