adamantine

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.

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.

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.

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

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