adamantine

timantinkova Made of adamant, or having the qualities of adamant; incapable of being break broken, dissolved, or penetrated

(ux)

Him the Almighty Power

Hurld headlong flaming from th' Ethereal Skie

With hideous ruine and combustion down

To bottomless perdition, there to dwell

In Adamantine Chains and penal Fire,

Who durst defie th' Omnipotent to Arms.

For two hours they stand; (w) sword glittering in his hand, adamantine resolution clouding his brows.

Sex law is the most adamantine instrument of sexual stratification and erotic persecution.