What does adamant mean?
Adamant describes someone who is utterly unwilling to change their mind or be persuaded, no matter what arguments or pressure they face. A person who is adamant about something holds their position with complete firmness — for example, remaining adamant that a decision will not be reversed. The word can describe either the person or their attitude, and it sits somewhere between admirable determination and outright stubbornness, depending on the speaker's point of view. The word has a remarkable history: it comes from the Greek 'adamas', meaning 'unconquerable' or 'untameable', which also gave us the word 'diamond'. In ancient and medieval thought, adamant named a legendary substance of impossible hardness, imagined as unbreakable by any force. That sense survives mainly in literature, while today the adjective dominates everyday use. It is a versatile, slightly formal word that adds weight to any statement of firm conviction.
Refusing to be persuaded or to change one's mind; unshakeably firm in one's position.
"She was adamant that the project would proceed as planned."
Most commonly used predicatively: 'he remained adamant', rather than 'an adamant man'.
A legendary impenetrably hard stone, traditionally identified with the diamond or lodestone.
"Medieval writers described walls forged of adamant that no weapon could breach."
This sense is now chiefly literary, historical, or figurative.
The word 'diamond' and 'adamant' come from the same Greek root — literally 'unconquerable' — which is why diamonds were once believed to be unbreakable.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of adamant
Adamant derives from the Greek 'adamas' (genitive 'adamantos'), meaning 'unconquerable' or 'untameable', formed from the negative prefix 'a-' combined with 'damao', 'to tame or subdue'. Latin adopted the word as 'adamans' or 'adamantas', referring to an extremely hard substance, and it passed into Old French before entering English in the Middle Ages. The same Greek root ultimately produced the word 'diamond', which evolved through Late Latin 'adamas' and Old French 'diamant'. The adjective use describing an unyielding person developed later, alongside the derivative form 'adamantine'.
Related word forms
How adamant is actually used
As an adjective, adamant is almost always used predicatively ('she was adamant') rather than attributively ('an adamant refusal'), though both occur. It carries a neutral-to-slightly-negative connotation depending on context — it can suggest admirable resolve or frustrating obstinacy. The noun sense referring to the legendary hard stone is now largely literary or historical.
Easily confused with adamant
Adamantine means 'extremely hard or unbreakable' (like the legendary stone), while adamant as an adjective describes a person's stubborn refusal to change their mind.