Unable to be harmed, hurt, or damaged by something; completely protected or safe from attack or injury.
From Latin 'in-' meaning not, combined with 'vulnerabilis' meaning woundable or capable of being hurt, which comes from 'vulnerare' meaning to wound. The term entered English in the 16th century to describe things that cannot be wounded or damaged.
The mythological concept of invulnerability—think Achilles or Superman—reveals something profound about human nature: we're fascinated by the idea of being completely safe because vulnerability is such a fundamental part of being alive, and that tension between strength and weakness drives countless stories.
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