Meanings (ES + gloss)
adamante (disused)
An imaginary rock or mineral of impenetrable hardness; a name given to the diamond and other substances of extreme hardness.
As an adamant harder than flint have I made thy forehead …
This then is and alwayes hath ben the fashion of Worldlinges, & reprobate persons, to harden their hartes as an adamant stone, against anye thinge that shalbe tolde the for amendem…