Definitions

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

  • adj. Impenetrable by bullets.
  • adj. Informal Impervious to assault, damage, or failure; guaranteed: a bulletproof method; bulletproof arguments.
  • transitive v. To make impenetrable by bullets.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Capable of withstanding a direct shot by a bullet fired from a gun.
  • adj. reliable, infallible, sturdy or error-tolerant.
  • adj. Unbreakable, very tough.
  • v. To make proof against bullets.
  • v. to make resistant to failure.

Etymologies

bullet +‎ -proof (Wiktionary)

Examples

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