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.

adamantine

/ ˌædəˈmæntaɪn /

adjective

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

Word History and Origins

Origin of adamantine¹

First recorded in 1200–1250; Middle English, from Latin adamantinus, from Greek adamántinos adamant, -ine ¹

Example Sentences

To love a Scorpio, then, is to fiercely protect their softness with the same shadowy ardor that they use to construct their inner adamantine fortresses.

From Los Angeles Times

Akira is not so much an obstacle, then, as he is a diamond in the rough, a permanent part of Takiko and her adamantine resolve to live on her own terms.

From Los Angeles Times

He’s since backed off a bit from his adamantine opposition, but the core of his position was concern that the measure would add to inflation.

From Los Angeles Times

George’s response to these tumults was, in Roberts’s phrase, “adamantine inflexibility.”

From Washington Post

Koirala, a Bollywood star, brings a taut poise to a mother whose veneer seems adamantine until the Duttas walk in the door.

From New York Times