- of or like adamant; very hard, as dental enamel; unbreakable
- unyielding; firm
Origin of adamantineMiddle English from Classical Latin adamantinus, hard as steel from Classical Greek adamantinos
- Made of or resembling adamant.
- Having the hardness or luster of a diamond.
- Unyielding; inflexible: “If there is one dominant trait that emerges from this account, it is adamantine willpower” ( Eugene Linden )
(comparative more adamantine, superlative most adamantine)
From Latin adamantinus.