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Szótár

bulletproof []

a (context|of a material) Capable of withstanding a direct shot by a bullet fired from a gun.

a (idiomatic) reliable, infallible, sturdy or error-tolerant.

a (usually|of an idea or concept) unbreakable | Unbreakable, very tough.

v To make proof against bullets.

v (slang) to make resistant to failure.