Invulnerableness is a word that describes the state of being impossible to harm or damage. However, there are several synonyms that convey the same meaning. One such synonym is "impregnability," which refers to the state of being unconquerable or impenetrable. Another synonym for invulnerableness is "invincibility," which denotes the ability to resist and overcome any forces or challenges. "Indestructibility" is also a synonym for invulnerableness that refers to the quality of being indestructible or immune to damage. Finally, "imperishability" is another synonym for invulnerableness, which suggests an enduring quality that withstands the test of time.