adamantine [ ad-uh-man-teen, -tin, -tahyn ]adjective
1. utterly unyielding or firm in attitude or opinion.
2. too hard to cut, break, or pierce.
3. like a diamond in luster.WORDS RELATED TO ADAMANTINE
adamant, firm, hardheaded, implacable, incompliant, inexorable, inflexible, intransigent, mulish, obdurate, obstinate, opinionated, pigheaded, relentless, remorseless, rigid, unbendable, unbending, unbreakable, uncompliantSee more synonyms on Thesaurus.comOrigin:
1200–1250; Middle English < Latin adamantinus < Greek adamántinos.See adamant, -ineEXAMPLE 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
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