adamant

Firm; unshakeable; unyielding; determined.

Broiles and Kirkley were adamant about getting out of the lawsuit, but Mike and Dee were equally adamant about not wanting to sign a letter of apology

Johan is determined to play the field and adamant about never committing.

Very difficult to break, pierce, or cut.

Unprotected matter, however adamant, would have been ground to dust ages ago.

An unspecified mineral or rock of virtually impenetrable hardness.

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 amendement of their lives, and for the savinge of their soules.

As an adamant harder than flint have I made thy forehead […]

An unspecified mineral or rock of virtually impenetrable hardness.

An unspecified mineral or rock of virtually impenetrable hardness.

You draw me, you hard-hearted adamant: / But yet you draw not iron, for all my heart / Is true as steel. Leave you your power to draw, / And I shall have no power to follow you.

An unspecified mineral or rock of virtually impenetrable hardness.

An Adamant hinders the attractive vertue, as also Garlick rubbed on the Magnet; for its attractive faculty is not so valid, but it may be easily deluded, obscured, and superated […]

But we know from book 37 of the Natural History that adamant works on magnets in exactly the same way that garlic does: robbing them of their power to attract.

Chiefly in of adamant: an embodiment of impenetrable hardness; the quality of not being easily destroyed or overcome; impenetrableness, imperviousness, impregnableness; also, of a person: the quality of not being easily affected emotionally

Actual life might seem to her so real that she could not detect the union of shadow and adamant that men call poetry.