INFLEX'IBLENESS, noun [Latin in and flexibilis, from flecto, to bend.] 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.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI