adamantine

[ad-uh-man-teen, -tin, -tahyn]
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:
1200–1250; Middle English < Latin adamantinus < Greek adamántinos. See adamant, -ine1

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World English Dictionary
adamantine (ˌædəˈmæntaɪn)
 
adj
1.  very hard; unbreakable or unyielding
2.  having the lustre of a diamond

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

adamantine
late 14c., from L. adamantinus, from Gk. adamantinos, from adamas (see adamant).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In doing so, it continues to exert pressure on the adamantine surface of oppression.
Her fluent mendacity, combined with adamantine confidence, made her really indomitable.
Adamantine adherence to political principle is nothing new, of course.
The unambiguous factuality of a single achievement is adamantine.
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