Usually means: Extremely hard and unyielding nature.
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We found 10 dictionaries that define the word adamantean:

General (10 matching dictionaries)
  1. adamantean: Collins English Dictionary
  2. adamantean: Wordnik
  3. adamantean: Wiktionary
  4. Adamantean: Dictionary.com
  5. Adamantean: Online Plain Text English Dictionary
  6. adamantean: Webster's Revised Unabridged, 1913 Edition
  7. Adamantean: AllWords.com Multi-Lingual Dictionary
  8. adamantean: Webster's 1828 Dictionary
  9. adamantean: FreeDictionary.org
  10. Adamantean: TheFreeDictionary.com

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Definitions from Wiktionary (adamantean)

▸ adjective:  Of adamant; hard as adamant.

Similar:
hard, brazen, obdurate, hard as nails, bone hard, hard as iron, hard as a rock, hard-ass, inexorable, hard as the nether millstone, more...

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Similar:
hard, brazen, obdurate, hard as nails, bone hard, hard as iron, hard as a rock, hard-ass, inexorable, hard as the nether millstone, more...



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