See also: bullet-proof

English

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Alternative forms

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Etymology

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bullet +‎ -proof

Pronunciation

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  • IPA(key): /bʊl.ɪtpɹuːf/
  • Audio (General Australian):(file)
  • Hyphenation: bul‧let‧proof

Adjective

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bulletproof (comparative more bulletproof, superlative most bulletproof)

  1. (of a material) Capable of withstanding a direct shot by a bullet fired from a gun.
    A bulletproof window.
    A bulletproof vest.
  2. (idiomatic) Reliable, infallible, sturdy or error-tolerant.

Synonyms

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Derived terms

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Translations

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Verb

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bulletproof (third-person singular simple present bulletproofs, present participle bulletproofing, simple past and past participle bulletproofed)

  1. To make proof against bullets.
  2. (slang) to make resistant to failure.
    We have to bulletproof this program before we let the users at it; check every input, catch every possible flaw...it must not fail in use.