bulletproof

[bʊl.ɪtpɹuːf]

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A bulletproof vest or car is one that can protect its wearer or occupants from being hurt by bullets.

You probably know what it's like to worry about getting shot at, especially if you've seen action movies or read crime novels. The word "bulletproof" has become a part of our popular culture because of this fear. In real life, people who work in law enforcement often wear bulletproof vests when they go on duty, and some high-end cars even come equipped with bulletproof glass to protect passengers from stray bullets.

How common is "bulletproof"?

Word bulletproof is considered rare in modern English.
It has a balanced usage among all categories: speech, fiction, newspapers and academic texts.

Definitions

verb

To make proof against bullets.
To make resistant to failure.
Example: 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.

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adjective

(of a material) Capable of withstanding a direct shot by a bullet fired from a gun.
Example: A bulletproof window.
Reliable, infallible, sturdy or error-tolerant.
(usually of an idea or concept) Unbreakable, very tough.

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foolproof