Rigidity

adjective
1.
stiff or unyielding; not pliant or flexible; hard:
a rigid strip of metal.
2.
firmly fixed or set.
3.
inflexible, strict, or severe:
a rigid disciplinarian; rigid rules of social behavior.
4.
exacting; thorough; rigorous:
a rigid examination.
5.
so as to meet precise standards; stringent:
lenses ground to rigid specifications.
6.
Mechanics. of, relating to, or noting a body in which the distance between any pair of points remains fixed under all forces; having infinite values for its shear modulus, bulk modulus, and Young’s modulus.
7.
Aeronautics.

(of an airship or dirigible) having a form maintained by a stiff, unyielding structure contained within the envelope.
pertaining to a helicopter rotor that is held fixedly at its root.

adjective
1.
not bending; physically inflexible or stiff: a rigid piece of plastic
2.
unbending; rigorously strict; severe: rigid rules
adverb
3.
completely or excessively: the lecture bored him rigid

rigidity ri·gid·i·ty (rĭ-jĭd’ĭ-tē)
n.

The quality or state of stiffness or inflexibility. Also called rigor.

An aspect of the personality characterized by resistance to change.