Webster's Revised Unabridged Dictionary · 1913

Inflexibility

Inflexibility , noun

[Compare French 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. — Churchill
The purity and inflexibility of their faith. — T. Warton