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adamantine

[ad-uh-man-teen, -tin, -tahyn]
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adjective
  1. utterly unyielding or firm in attitude or opinion.
  2. too hard to cut, break, or pierce.
  3. like a diamond in luster.
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Origin of adamantine

1200–1250; Middle English < Latin adamantinus < Greek adamántinos. See adamant, -ine1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for adamantine

adamantine

adjective
  1. very hard; unbreakable or unyielding
  2. having the lustre of a diamond
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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

Word Origin and History for adamantine

adj.

c.1200, from Latin adamantinus "hard as steel, inflexible," from Greek adamantinos, from adamas (see adamant (n.)).

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Online Etymology Dictionary, © 2010 Douglas Harper