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Webster 1913 Edition
Inflexibleness
In-flex′i-ble-ness
,Noun.
 The quality or state of being inflexible; inflexibility; rigidity; firmness. 
Webster 1828 Edition
Inflexibleness
INFLEX'IBLENESS
,Noun.
 1.
  The quality of being inflexible, or not capable of being bent; unyielding stiffness.2.
  Obstinacy of will or temper; firmness of purpose that will not yield to importunity or persuasion; unbending pertinacity.Definition 2025
inflexibleness
inflexibleness
English
Noun
inflexibleness (uncountable)
- The quality or state of being inflexible; inflexibility; rigidity; firmness.
 - Obstinacy of will or temper; firmness of purpose that will not yield to importunity or persuasion; unbending pertinacity.
 
References
- “inflexibleness” in An American Dictionary of the English Language, by Noah Webster, 1828.
 - inflexibleness in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913