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adamant

[ad-uh-muh nt, -mant] /ˈæd ə mənt, -ˌmænt/
adjective
1.
utterly unyielding in attitude or opinion in spite of all appeals, urgings, etc.
2.
too hard to cut, break, or pierce.
noun
3.
any impenetrably or unyieldingly hard substance.
4.
a legendary stone of impenetrable hardness, formerly sometimes identified with the diamond.
Origin
900
before 900; Middle English < Old French adamaunt < Latin adamant- (stem of adamas) hard metal (perhaps steel), diamond < Greek, equivalent to a- a-6 + -damant- verbal adjective of damân to tame, conquer; replacing Old English athamans (< Medieval Latin) and Middle English aymont < Middle French aimant < Vulgar Latin *adimant- < Latin
Related forms
adamancy
[ad-uh-muh n-see] /ˈæd ə mən si/ (Show IPA),
adamance, noun
adamantly, adverb
unadamant, adjective
Synonyms
1. inflexible, rigid, uncompromising.
Antonyms
1. flexible, easygoing, yielding.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for adamance

adamant

/ˈædəmənt/
adjective
1.
unshakable in purpose, determination, or opinion; unyielding
2.
a less common word for adamantine (sense 1)
noun
3.
any extremely hard or apparently unbreakable substance
4.
a legendary stone said to be impenetrable, often identified with the diamond or loadstone
Derived Forms
adamantly, adverb
Word Origin
Old English: from Latin adamant-, stem of adamas, from Greek; literal meaning perhaps: unconquerable, from a-1 + daman to tame, conquer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for adamance
adamant
late 14c., "hard, unbreakable," from earlier noun (O.E. aðamans) meaning "a very hard stone," from L. adamantem (nom. adamas), from Gk. adamas (gen. adamantos) "unbreakable," the name of a hypothetical hardest material, perhaps lit. "invincible," from a- "not" + daman "to conquer, to tame" (see tame), or else a word of foreign origin altered to conform to Gk. Applied in antiquity to white sapphire, magnet (perhaps via confusion with L. adamare "to love passionately"), steel, emery stone, and especially diamond (see diamond). Figurative sense of "unshakeable" first recorded 1670s.
Online Etymology Dictionary, © 2010 Douglas Harper
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adamance in the Bible

(Heb. shamir), Ezek. 3:9. The Greek word adamas means diamond. This stone is not referred to, but corundum or some kind of hard steel. It is an emblem of firmness in resisting adversaries of the truth (Zech. 7:12), and of hard-heartedness against the truth (Jer. 17:1).

Easton's 1897 Bible Dictionary
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