adj

bulletproof

BUU-lihtp-roof

adj

Able to stop a bullet fired from a gun.

"The officer wore a bulletproof vest under her uniform."

So reliable or well-designed that it can't fail or be challenged.

"His alibi was bulletproof — there was no way to disprove it."

verb

To make something resistant to failure or attack.

"They spent months bulletproofing the contract against legal challenges."

How to Use Bulletproof

Learner’s notes

In plain EnglishAble to stop bullets, or figuratively so solid it can't be broken or disproven.

Common pairings

bulletproof vest bulletproof glass bulletproof argument

more bulletproof comparative, bulletproofed past tense, bulletproofs plural, bulletproofs singular, most bulletproof superlative

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Can you complete this real example?

The officer wore a _____ vest under her uniform.

From bullet + proof, "resistant to."

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