Normally the skull protects the brain from damage through its hard unyieldingness; the skull is one of the least deformable structures found in nature with it needing the force of about 1 ton to reduce the diameter of the skull by 1 cm.
परिभाषा
resoluteness by virtue of being unyielding and inflexible पर्याय: adamance, obduracy,
मोबाइल