utterly unyielding or firm in attitude or opinion.
too hard to cut, break, or pierce.
like a diamond in luster.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use adamantine in a sentence
Each bound to the other, through all the vicissitudes of life, in adamantine bonds of love and admiration!
The Jew is the dreamer in action, combining fluid imagination with adamantine purpose.Modernities | Horace Barnett Samuel
This electronic device Nick had stolen to operate the three ponderous triple-fold gates of adamantine, brass and iron.Satan and the Comrades | Ralph Bennitt
Moreover, the Hostel's point of view on the subject was as adamantine as it was universal.The War-Workers | E.M. Delafield
Watching us over the adamantine walls and all that kind of thing.The Wonderful Visit | Herbert George Wells
British Dictionary definitions for adamantine
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