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.