Definition of "bullet-proof" []

• Alternative spelling of bulletproof. (Capable of withstanding a direct shot, reliable, or unbreakable). (adjective)

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• "Of course the public already knows this through the Mona Lisa, but like so many works that have achieved the status of icons, the painting has become almost impossible to actually see this is also true in literal terms, with the canvas encased in bullet-proof glass and surrounded by throngs of tourists."
• "Though Rembrandt's reputation remains bullet-proof, he no longer receives—and probably never needed—the cultic adulation he enjoyed in the 19th and early 20th centuries."
• "About a block away, the agents put on bullet-proof vests and, just before 6 a.m., walked swiftly back down the street to the glass double doors of Mr. Chiasson's building."