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adamantine

[ad-uh-man-teen, -tin, -tahyn] /ˌæd əˈmæn tin, -tɪn, -taɪn/
adjective
1.
utterly unyielding or firm in attitude or opinion.
2.
too hard to cut, break, or pierce.
3.
like a diamond in luster.
Origin of adamantine
1200-1250
1200-1250; Middle English < Latin adamantinus < Greek adamántinos. See adamant, -ine1
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for adamantine

adamantine

/ˌædəˈmæntaɪn/
adjective
1.
very hard; unbreakable or unyielding
2.
having the lustre of a diamond
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for adamantine
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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