adamant
//ˈæd.ə.mənt//
Adjective
adamantCanonical form
1
Refusing to be persuaded or to change one's mind; stubbornly unyielding.
She was adamant that she would not change her decision.
Synonym
Noun
1
A legendary rock or mineral of impenetrable hardness, sometimes identified with diamond or lodite.
Ancient legends spoke of a fortress built from adamant, which no weapon could breach.