Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Immune to attack; impregnable.
  • adj. Impossible to damage, injure, or wound.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Incapable of being wounded, or of receiving injury; not vulnerable.
  • adj. Unanswerable; irrefutable; unable to be damaged by an attack or convinced; as, an invulnerable argument.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Incapable of being wounded, or of receiving injury.
  • adj. Unanswerable; irrefutable; that can not be refuted or convinced.

from The Century Dictionary and Cyclopedia

  • Not vulnerable; incapable of being wounded, hurt, or harmed.
  • Hence Not to be damaged or injuriously affected by attack: as, invulnerable arguments or evidence.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. immune to attack; impregnable

Etymologies

French invulnérable, from Old French, from Latin invulnerābilis : in-, not; see in-1 + vulnerāre, to wound (from vulnus, vulner-, wound; see vulnerable).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin invulnerābilis, from vulnerābilis, from vulnerō ("I wound"), from vulnus ("wound"). (Wiktionary)

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