What is the meaning of Adamantine?

Synonym of adamant.

1. Made of adamant (“an unspecified mineral or rock of virtually impenetrable hardness”).
2. 2. Incapable of being broken, dissolved, or penetrated; impenetrable, unbreakable.

      Made of adamant (“an unspecified mineral or rock of virtually impenetrable hardness”).

      2. Incapable of being broken, dissolved, or penetrated; impenetrable, unbreakable.

         Incapable of being broken, dissolved, or penetrated; impenetrable, unbreakable.

         Difficult to defeat or prevail over; unshakable, unyielding.

         Of a person: refusing to change one's mind; obstinate, stubborn.

         Having the quality of attracting or drawing; attractive, magnetic.

         Like diamond in lustre; bright, lustrous, shiny; also, of a lustre: like that of a mineral with a high refractive index such as diamond.

         Synonym of adamantium (“a fictional metal which is indestructible or nearly so”).

         feminine singular of adamantin

         feminine plural of adamantino

         vocative masculine singular of adamantinus

         Relating to adamant; adamantine.

         Source: wiktionary.org