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adamantine

[ ad-uh-man-teen, -tin, -tahyn ]

/ ˌæd əˈmæn tin, -tɪn, -taɪn /

SEE SYNONYMS FOR adamantine ON THESAURUS.COM

adjective

utterly unyielding or firm in attitude or opinion.

too hard to cut, break, or pierce.

like a diamond in luster.

Origin of adamantine

1200–1250; Middle English < Latin adamantinus < Greek adamántinos. See adamant, -ine¹

Words nearby adamantine

adam's-needle, adam-and-eve, adama, adamant, adamantane, adamantine, adamantine membrane, adamantinoma, adamawa, adamawa massif, adamawa-eastern

Example sentences from the Web for adamantine

The Latin hyacinthĭnus and adamantĭnus are parallel words, yet Milton has 'hyacinthin' for the one and 'adamantine' for the other.

Society for Pure English Tract 4 |John Sargeaunt
Why should the "adamantine lips" of sixty-eight pounders salute those little babies?

Punch - Volume 25 (Jul-Dec 1853) |Various
But Sir John had met all her wiles with his adamantine smile.

With Edged Tools |Henry Seton Merriman
Again—“Before I die, I think my literary fame may be fixed on an adamantine foundation.”

Calamities and Quarrels of Authors |Isaac Disraeli

Both are free to follow and fulfil the law of their nature, and both are alike bound by that law, as by an adamantine chain.

Aids to Reflection |Samuel Taylor Coleridge

British Dictionary definitions for adamantine

adamantine

/ (ˌædəˈmæntaɪn) /

adjective

very hard; unbreakable or unyielding

having the lustre of a diamond