Etymology
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invulnerable (adj.)

1590s, from Latin invulnerabilis "invulnerable," from in- "not" (see in- (1)) + vulnerabilis (see vulnerable). Related: Invulnerably.

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Definitions of invulnerable

invulnerable (adj.)
immune to attack; impregnable;
gunners raked the beach from invulnerable positions on the cliffs
From wordnet.princeton.edu