Brittleness

noun

1. Instability; changeableness.
2. The property of breaking readily with a comparatively smooth fracture; frangibility: the opposite of toughness and tenacity.
3. Aptness to break; fragility.
4. The property by virtue of which a material is fractured without appreciable deformation by the application of load
5. The state of being brittle; aptness to break; fragility.