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adamantine

[ ad-uh-man-teen, -tin, -tahyn ]
/ ˌæd əˈmæn tin, -tɪn, -taɪn /
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adjective

utterly unyielding or firm in attitude or opinion.
too hard to cut, break, or pierce.
like a diamond in luster.

QUIZZES

QUIZ YOURSELF ON “THEIR,” “THERE,” AND “THEY’RE”

Are you aware how often people swap around “their,” “there,” and “they’re”? Prove you have more than a fair grasp over these commonly confused words.
Question 1 of 7
Which one of these commonly confused words can act as an adverb or a pronoun?

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. 2021

Example sentences from the Web for adamantine

British Dictionary definitions for adamantine

adamantine
/ (ˌædəˈmæntaɪn) /

adjective

very hard; unbreakable or unyielding
having the lustre of a diamond
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
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