In*flex"i*bil"i*ty (?), n. [Cf. F. inflexibilité.] The quality or state of being inflexible, or not capable of being bent or changed; unyielding stiffness; inflexibleness; rigidity; firmness of will or purpose; unbending pertinacity; steadfastness; resoluteness; unchangeableness; obstinacy.

The inflexibility of mechanism.
A. Baxter.

That grave inflexibility of soul.

The purity and inflexibility of their faith.
T. Warton.