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