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ENGLISH · A WORD WITH POSSIBILITIES

bulletproof.

Capable of withstanding a direct shot by a bullet fired from a gun.

11 characters3 syllables approx.English language

Meaning & usage

adj/ˈbʊlɪtpɹuːf/Received-Pronunciation/ˈbɵlɪtpɹʉwf/British, Southern, Standard/ˈbʊlɪtpɹuf/General-American/ˈbʊlɪtpɹʉːf/Australia, New-Zealand

  1. Capable of withstanding a direct shot by a bullet fired from a gun.

    bulletproof window
    bulletproof vest

  2. Reliable, infallible, sturdy or error-tolerant.

    figuratively
    bulletproof hosting
Where this word comes from

Etymology tree English bullet English proof English -proof English bulletproof From bullet + -proof.

verb/ˈbʊlɪtpɹuːf/Received-Pronunciation/ˈbɵlɪtpɹʉwf/British, Southern, Standard/ˈbʊlɪtpɹuf/General-American/ˈbʊlɪtpɹʉːf/Australia, New-Zealand

  1. To make proof against bullets.

    transitive

  2. To make resistant to failure.

    informal · transitive
    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.
Where this word comes from

Etymology tree English bullet English proof English -proof English bulletproof From bullet + -proof.

noun/ˈbʊlɪtpɹuːf/Received-Pronunciation/ˈbɵlɪtpɹʉwf/British, Southern, Standard/ˈbʊlɪtpɹuf/General-American/ˈbʊlɪtpɹʉːf/Australia, New-Zealand

  1. A liquor store

    slang
Where this word comes from

Etymology tree English bullet English proof English -proof English bulletproof From bullet + -proof.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.