• synonyms


[ad-uh-man-teen, -tin, -tahyn]
See more synonyms for adamantine on Thesaurus.com
  1. utterly unyielding or firm in attitude or opinion.
  2. too hard to cut, break, or pierce.
  3. like a diamond in luster.
Show More

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

Examples from the Web for adamantine

Historical Examples

British Dictionary definitions for adamantine


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


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

Show More
Online Etymology Dictionary, © 2010 Douglas Harper