'Adamant' definitions:

Definition of 'adamant'

From: WordNet
adjective
Impervious to pleas, persuasion, requests, reason; "he is adamant in his refusal to change his mind"; "Cynthia was inexorable; she would have none of him"- W.Churchill; "an intransigent conservative opposed to every liberal tendency" [syn: adamant, adamantine, inexorable, intransigent]
noun
Very hard native crystalline carbon valued as a gem [syn: diamond, adamant]

Definition of 'Adamant'

From: Easton
  • Adamant (Heb. shamir), Ezek. 3:9. The Greek word adamas means diamond. This stone is not referred to, but corundum or some kind of hard steel. It is an emblem of firmness in resisting adversaries of the truth (Zech. 7:12), and of hard-heartedness against the truth (Jer. 17:1).