adjective

invulnerable

in-VUL-ner-uh-buhl/ɪnˈvʌlnərəbl/

Impossible or extremely difficult to harm or defeat.

The nearly invulnerable strongbox survives fire, falling masonry, and attempted burglary unharmed.

A completely intact strongbox amid several visibly destructive forces: collapsed masonry, fire, and shattered burglary tools surround it, yet its body, door, and lock remain undamaged.

Etymology

inLatinnot

+vulnerLatinto wound

+ableLatincapable of being

The pieces express “not capable of being wounded.” The physical idea of resisting wounds extends naturally to being protected against harm or damage more generally.

In context

Rotten Tomatoes TV19:13

much like the samurai they can still get gunned down you know they're not impervious they're not invulnerable so he has to be careful

Sam Witwer & Dave Filoni on Becoming 'Star Wars: Maul -- Shadow Lord'

More examples

No computer system is completely invulnerable to attack.
After three straight wins, the team feels invulnerable.
Her confidence makes her seem invulnerable to criticism.

Forms

invulnerable

invulnerability noun — The state of being safe from harm.

Similar words

invincible: Emphasizes being impossible to defeat rather than to injure.
indestructible: Emphasizes resistance to destruction rather than injury or defeat.
impervious: Usually describes resistance to a particular substance or influence.