Incapability of, or exemption from, suffering; insusceptibility to injury.

The condition of having successfully stood a test, or the capability of doing so; proven or tested power, strength, etc. (originally and chiefly…

Freedom or exemption (from any natural or usual liability); protection (from or against anything evil or injurious); an instance of this. Also…

impassability.

= impassibility, n.

= invulnerability, n.

The quality or state of being invulnerable; incapability of being wounded or injured.

A place which can easily be defended against attack; a stronghold; a fortress. Also figurative.