Adamantine

//ˌædəˈmæntaɪn// adj, noun

Definitions

Adjective
  1. 1
    Synonym of adamant.; Made of adamant (“an unspecified mineral or rock of virtually impenetrable hardness”).

    "[A]t laſt appeer / Hell bounds high reaching to the horrid Roof, / And thrice threefold the Gates; three folds vvere Braſs, / Three iron, three of Adamantine Rock, / Impenitrable, impal'd vvith circling fire, / Yet unconsum'd."

  2. 2
    Synonym of adamant.; Incapable of being broken, dissolved, or penetrated; impenetrable, unbreakable. figuratively

    "adamantine bonds    adamantine chains"

  3. 3
    Synonym of adamant.; Difficult to defeat or prevail over; unshakable, unyielding. figuratively

    "For two hours they stand; [François Claude Amour, marquis de] Bouillé's sword glittering in his hand, adamantine resolution clouding his brows; […]"

  4. 4
    Synonym of adamant.; Of a person: refusing to change one's mind; obstinate, stubborn. figuratively

    "I thought this last information would soften the young man, but he was adamantine. He informed me that it was against all bank rules for a woman to draw from her husband's deposit without his order."

  5. 5
    Synonym of adamant.; Having the quality of attracting or drawing; attractive, magnetic. figuratively, obsolete

    "Embravvne your ſoft-skind encloſure vvith Adamantine duſt, that it may dravve nothing but ſteele vnto it."

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  1. 6
    Like diamond in lustre; bright, lustrous, shiny; also, of a lustre: like that of a mineral with a high refractive index such as diamond.

    "Raspite, a new dimorphous form of lead tungstate, is found on some of the stolzite specimens as brownish or yellow monoclinic crystals with a strong adamantine lustre."

Adjective
  1. 1
    impervious to pleas, persuasion, requests, reason wordnet
  2. 2
    having the hardness of a diamond wordnet
  3. 3
    consisting of or having the hardness of adamant wordnet
Noun
  1. 1
    Synonym of adamantium (“a fictional metal which is indestructible or nearly so”). also, attributive, uncountable

Etymology

Etymology 1

From Middle English adamantine, adamantyne, adamauntyn (“(adjective) of adamant; (noun) adamant”), from Anglo-Norman adamantin and Middle French adamantin (“of or resembling adamant or diamond”) (modern French adamantin), and from its etymon Latin adamantinus (“adamantine”), from Ancient Greek ἀδᾰμάντῐνος (adămántĭnos, “hard as adamant; made of steel”), from ᾰ̓δᾰμᾰντ- (ădămănt-) (a stem of ἀδάμᾱς (adámās, “the hardest metal (probably steel); diamond”), possibly originally Semitic) + -ῐνος (-ĭnos, suffix meaning ‘made of’ forming adjectives). By surface analysis, adamant + -ine (suffix meaning ‘of or pertaining to’ forming adjectives). Etymology 1 sense 1.2.4 (“having the quality of attracting or drawing”) and etymology 1 sense 2 (“like diamond in lustre; etc.”) refer to adamant (“(archaic) lodestone; (historical, poetic) diamond”).

Etymology 2

Possibly from adamantium + -ine (suffix forming the names of chemical substances or materials).

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