IPA: /ɪnˈvʌlnərəbl/
KK: /ɪnˈvʌlnərəbl/
Not able to be harmed or damaged; completely safe from attack or injury.
The superhero was considered invulnerable, able to withstand any attack without injury.
Invulnerable → It is formed from "in-" (meaning not) and "vulnerabilis" (from Latin "vulnerare", meaning to wound). The word describes something that cannot be wounded or harmed.
Think of 'not' ('in-') being able to be 'wounded' ('vulnerare') — that's why invulnerable means unable to be harmed.