Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Impervious to pleas, appeals, or reason; stubbornly unyielding. See Synonyms at inflexible.
  • n. A stone once believed to be impenetrable in its hardness.
  • n. An extremely hard substance.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Firm; unshakeable; unyielding; determined.
  • n. A rock or mineral held by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness.
  • n. An embodiment of impregnable hardness.
  • n. A magnet; a lodestone.

from the GNU version of the Collaborative International Dictionary of English

  • n. A stone imagined by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness; but in modern mineralogy it has no technical signification. It is now a rhetorical or poetical name for the embodiment of impenetrable hardness.
  • n. Lodestone; magnet.

from The Century Dictionary and Cyclopedia

  • n. A name applied with more or less indefiniteness to various real or imaginary metals or minerals characterized by extreme hardness: as the diamond
  • n. the natural opposite of the diamond
  • n. a lodestone or magnet, and
  • n. an anti-magnet.
  • n. In general, any substance of impenetrable or surpassing hardness; that which is impregnable to any force.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. impervious to pleas, persuasion, requests, reason
  • n. very hard native crystalline carbon valued as a gem

Etymologies

From Middle English, a hard precious stone, from Old French adamaunt, from Latin adamās, adamant-, from Greek, unconquerable, hard steel, diamond; see demə- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin adamantem, accusative singular form of adamās ("hard as steel"), from Ancient Greek ἀδάμας (adamas, "invincible"), from ἀ- (a-, "not") + δαμάζω (damazo, "I tame"). (Wiktionary)

Examples

Comments

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  • BK is an adamant manager who never accepts suggestions from his team members.

    February 15, 2013

  • Aw shoot! I must have left the sugar out.

    December 25, 2009

  • adamant can also be used to describe one's refusal to be persuaded or change mind

    July 5, 2009

  • What, it doesn't mean to have hidden vices? "Don't smoke, don't drink...what do you do?"

    April 10, 2009

  • "But truth is hard as adamant and tender as a blossom." -Mahatma Gandhi (An Autobiography or The Story of My Experiments with Truth)

    March 7, 2009

  • i also really wanted to include this, from the Oxford dictionary:
    ORIGIN Old English (as a noun), from Old French adamaunt-, via Latin from Greek adamas, adamant, ‘untamable, invincible’ (later used to denote the hardest metal or stone, hence diamond), from a- ‘not’ + daman ‘to tame.’ The phrase to be adamant dates from the 1930s, although adjectival use had been implied in such collocations as “an adamant heart�? since the 16th cent.

    November 22, 2008

  • one of my very favourite words. they forgot to put in the definition "a legendary rock or mineral to which many, often contradictory, properties were attributed, formerly associated with diamond or lodestone." that's my favourite part of this word.

    November 22, 2008

  • i particularly like the collocation "to be adamant that"

    September 2, 2008

  • see also syn. adamantine (poet.) - "unbreakable"

    September 2, 2008