What is the meaning of Adamant?

Firm; unshakeable; unyielding; determined.

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.

A lodestone.

A substance that neutralizes lodestones.

The mineral, diamond

A gemstone made from diamond.

alternative form of adhmaint (“adamant, lodestone; magnet”)

third-person plural present active indicative of adamō

adamant, adamantine (valuable gemstone)

An invulnerable or indomitable object

A natural magnet; magnetite.

adamant; diamond

lodestone; magnet

adamant (an imaginary rock or mineral of impenetrable hardness; a name given to the diamond and other substances of extreme hardness)

diamond

diamond

Source: wiktionary.org