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Meaning of adamantine

ad•a•man•tine

Pronunciation: (ad"u-man'tēn, -tin, -tīn), [key]
— adj.
  1. utterly unyielding or firm in attitude or opinion.
  2. too hard to cut, break, or pierce.
  3. like a diamond in luster.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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