the.com/inflexibility
The proud refusal to bend, right up until the moment you break.
means The quality of being rigid, unwilling to change position, opinion, or shape under pressure.
from From Latin flectere, to bend, plus the negating in-; literally the inability to bow, in joints or in judgment.
Physics twinStiff materials snap; flexible ones survive the storm.
Spinal truthRigid backbones fracture before they curve.
Mind versionOften mistaken for principle, usually just fear.