unyielding

If it is properly put together it will remain rigid and unyielding.

Peaceful studied his face, found it stern and unyielding, and nodded assent.

But one answer--a stern, unyielding NO--will be given to all such proposals.

As she took him she felt the chill of the stiff, unyielding small body.

There was a devilish cruelty in every line in his hard, unyielding features.

Then, after a while, he sat looking out of the window with a hard, unyielding stare.

From it she judged him malleable now, that had been so stern and unyielding before.

He saw the stern, unyielding compression of the lean, muscular jaws.

Iredale asked, poising his glass on one of the unyielding arms of his chair.

There was something so unyielding in the keen, aquiline nose and pointed chin.