A protective barrier that does not penetrate.

An object lacking the ability to pierce surfaces.

A type of bullet designed for non-penetration effects.

An entity in discussions or debates with limited influence.

Not capable of entering or passing through.

Lacking the ability to infiltrate materials.

Incapable of breaking into a surface.

Describing tools that do not pierce objects.

Referring to substances that don’t permeate barriers.

Characterizing phenomena with no invasive properties.