rigiditynoun [ U ]
/rəˈdʒɪd·ɪ·t̬i/the quality or characteristic of not permitting any change:
We will make sure that federal law operates with high standards and common sense, not just bureaucratic rigidity (= not just lack of willingness to change by government officials ).
the quality of not being able to bend or be bent:
Steel is known to lose half of its rigidity at 1,000 degrees and begins to melt at 2,750 degrees.