unbrittleness

• a word derived from brittle.
  brittle

  adjective

  having hardness and rigidity but little tensile strength; breaking readily with a comparatively smooth fracture, as glass.

More Suggestions

• littleness
• unbearableness
• brittlebush
• embrittlement
• variableness
• undesirableness
• unattainableness
• abrasiveness
• audibleness