adamantine

[ad-uh-man-teen, -tin, -tahyn] Example Sentences Origin

ad·a·man·tine

[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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Adamantine is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a chattering or flighty, light-headed person.
Example Sentences
  • Her fluent mendacity, combined with adamantine confidence, made her really indomitable.
  • In doing so, it continues to exert pressure on the adamantine surface of oppression.
Collins
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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