(said of people and their conviction) Firm; unshakeable; unyielding; determined. / (of an object) Very difficult to break, pierce, or cut.

An imaginary rock or mineral of impenetrable hardness; a name given to the diamond and other substances of extreme hardness. / An embodiment of impregnable hardness. / (obsolete) A lodestone.

Of adamant; hard as adamant.

Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated. / Like the diamond in hardness or luster.

Having an extended tetrahedral configuration, as in diamond, or adamantane.

(organic chemistry) A polycyclic hydrocarbon, C₁₀H₁₆, having a cagelike structure similar to a portion of the diamond lattice; any of its derivatives

In an immovable or inflexible manner.

plural of adamant

The quality of being adamant

The property of being adamant.