Invulnerable (adjective)

Protected from harm; immune to attack; not susceptible to injury or damage.

Origin:

From the latin invulnerabilis, from in- (not) + vulnerabilis (vulnerable).

Examples:

1. The castle was considered invulnerable to enemy attacks.
2. The superhero had an invulnerable shield that protected him from harm.
3. The fortress was built with invulnerable materials to withstand any type of attack.
4. The shield made the warriors feel invulnerable and invincible in battle.
5. The new armor made the soldiers feel invulnerable to enemy weapons.