adamant (n.)
legendary substance of great hardness and magnetism
1H6 I.iv.52[Talbot to all, of the French] they supposed I could rend bars of steel / And spurn in pieces posts of adamant [i.e. kick to pieces]
MND II.i.195[Helena to Demetrius] You draw me, you hard-hearted adamant!
TC III.ii.177[Troilus to Cressida, of examples of lovers' comparisons] As iron to adamant
SHAKESPEARE'S WORDS © 2018 DAVID CRYSTAL & BEN CRYSTAL